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Internet Engineering Task Force (IETF) R. Gellens
Request for Comments: 7852
Updates: 6443, 6881 B. Rosen
Category: Standards Track NeuStar
ISSN: 2070-1721 H. Tschofenig
R. Marshall
TeleCommunication Systems, Inc.
J. Winterbottom
Winterb Consulting Services
July 2016
Additional Data Related to an Emergency Call
Abstract
When an emergency call is sent to a Public Safety Answering Point
(PSAP), the originating device, the access network provider to which
the device is connected, and all service providers in the path of the
call have information about the call, the caller, or the location,
which is helpful for the PSAP to have in handling the emergency.
This document describes data structures and mechanisms to convey such
data to the PSAP. The intent is that every emergency call carry as
much of the information described here as possible using the
mechanisms described here.
The mechanisms permit the data to be conveyed by reference (as an
external resource) or by value (within the body of a SIP message or a
location object). This follows the tradition of prior emergency
services standardization work where data can be conveyed by value
within the call signaling (i.e., in the body of the SIP message) or
by reference.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 7841.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc7852.
Gellens, et al. Standards Track [Page 1]
RFC 7852 Additional Call Data July 2016
Copyright Notice
Copyright (c) 2016 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 4
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 6
3. Document Scope . . . . . . . . . . . . . . . . . . . . . . . 7
4. Data Structures . . . . . . . . . . . . . . . . . . . . . . . 7
4.1. Data Provider Information. . . . . . . . . . . . . . . . . 9
4.1.1. Data Provider String . . . . . . . . . . . . . . . . . 9
4.1.2. Data Provider ID . . . . . . . . . . . . . . . . . . . 9
4.1.3. Data Provider ID Series . . . . . . . . . . . . . . . . 10
4.1.4. Type of Data Provider . . . . . . . . . . . . . . . . . 11
4.1.5. Data Provider Contact URI . . . . . . . . . . . . . . . 12
4.1.6. Data Provider Language(s) Supported . . . . . . . . . . 13
4.1.7. xCard of Data Provider . . . . . . . . . . . . . . . . 14
4.1.8. Subcontractor Principal . . . . . . . . . . . . . . . . 14
4.1.9. Subcontractor Priority . . . . . . . . . . . . . . . . 15
4.1.10. ProviderInfo Example . . . . . . . . . . . . . . . . . 15
4.2. Service Information . . . . . . . . . . . . . . . . . . . 18
4.2.1. Service Environment . . . . . . . . . . . . . . . . . . 18
4.2.2. Service Type . . . . . . . . . . . . . . . . . . . . . 19
4.2.3. Service Mobility Environment . . . . . . . . . . . . . 21
4.2.4. EmergencyCallData.ServiceInfo Example . . . . . . . . . 22
4.3. Device Information . . . . . . . . . . . . . . . . . . . . 22
4.3.1. Device Classification . . . . . . . . . . . . . . . . . 22
4.3.2. Device Manufacturer . . . . . . . . . . . . . . . . . . 23
4.3.3. Device Model Number . . . . . . . . . . . . . . . . . . 24
4.3.4. Unique Device Identifier . . . . . . . . . . . . . . . 24
4.3.5. Device/Service-Specific Additional Data Structure . . . 25
4.3.6. Device/Service-Specific Additional Data Structure Type 26
4.3.7. EmergencyCallData.DeviceInfo Example . . . . . . . . . 27
4.4. Owner/Subscriber Information . . . . . . . . . . . . . . . 27
4.4.1. Subscriber Data Privacy Indicator . . . . . . . . . . . 27
4.4.2. xCard for Subscriber's Data . . . . . . . . . . . . . . 28
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4.4.3. EmergencyCallData.SubscriberInfo Example . . . . . . . 29
4.5. Comment . . . . . . . . . . . . . . . . . . . . . . . . . 31
4.5.1. Comment . . . . . . . . . . . . . . . . . . . . . . . . 31
4.5.2. EmergencyCallData.Comment Example . . . . . . . . . . . 32
5. Issues with Getting New Types of Data into Use . . . . . . . 32
5.1. Choosing between Defining a New Type of Block or a New
Type of Device/Service-Specific Additional Data . . . . . 33
6. Data Transport Mechanisms . . . . . . . . . . . . . . . . . . 33
6.1. Transmitting Blocks Using Call-Info . . . . . . . . . . . 36
6.2. Transmitting Blocks by Reference Using the <provided-by>
Element . . . . . . . . . . . . . . . . . . . . . . . . . 37
6.3. Transmitting Blocks by Value Using the <provided-by>
Element . . . . . . . . . . . . . . . . . . . . . . . . . 38
6.4. The Content-Disposition Parameter . . . . . . . . . . . . 39
7. Examples . . . . . . . . . . . . . . . . . . . . . . . . . . 41
8. XML Schemas . . . . . . . . . . . . . . . . . . . . . . . . . 53
8.1. EmergencyCallData.ProviderInfo XML Schema . . . . . . . . 54
8.2. EmergencyCallData.ServiceInfo XML Schema . . . . . . . . . 56
8.3. EmergencyCallData.DeviceInfo XML Schema . . . . . . . . . 57
8.4. EmergencyCallData.SubscriberInfo XML Schema . . . . . . . 59
8.5. EmergencyCallData.Comment XML Schema . . . . . . . . . . . 60
8.6. provided-by XML Schema . . . . . . . . . . . . . . . . . . 61
9. Security Considerations . . . . . . . . . . . . . . . . . . . 62
10. Privacy Considerations . . . . . . . . . . . . . . . . . . . 64
11. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 67
11.1. Emergency Call Additional Data Registry . . . . . . . . . 67
11.1.1. Provider ID Series Registry . . . . . . . . . . . . . 67
11.1.2. Service Environment Registry . . . . . . . . . . . . . 68
11.1.3. Service Type Registry . . . . . . . . . . . . . . . . 68
11.1.4. Service Mobility Registry . . . . . . . . . . . . . . 68
11.1.5. Type of Provider Registry . . . . . . . . . . . . . . 69
11.1.6. Device Classification Registry . . . . . . . . . . . . 69
11.1.7. Device ID Type Registry . . . . . . . . . . . . . . . 69
11.1.8. Device/Service Data Type Registry . . . . . . . . . . 70
11.1.9. Emergency Call Data Types Registry . . . . . . . . . . 70
11.2. 'EmergencyCallData' Purpose Parameter Value . . . . . . . 72
11.3. URN Sub-Namespace Registration for <provided-by>
Registry Entry . . . . . . . . . . . . . . . . . . . . . 72
11.4. MIME Registrations . . . . . . . . . . . . . . . . . . . 72
11.4.1. MIME Content-Type Registration for
'application/EmergencyCallData.ProviderInfo+xml' . . . 72
11.4.2. MIME Content-Type Registration for
'application/EmergencyCallData.ServiceInfo+xml' . . . 73
11.4.3. MIME Content-Type Registration for
'application/EmergencyCallData.DeviceInfo+xml' . . . . 74
11.4.4. MIME Content-Type Registration for
'application/EmergencyCallData.SubscriberInfo+xml' . . 75
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11.4.5. MIME Content-Type Registration for
'application/EmergencyCallData.Comment+xml' . . . . . 76
11.5. URN Sub-Namespace Registration . . . . . . . . . . . . . 78
11.5.1. Registration for
urn:ietf:params:xml:ns:EmergencyCallData . . . . . . . 78
11.5.2. Registration for
urn:ietf:params:xml:ns:EmergencyCallData:ProviderInfo . 78
11.5.3. Registration for
urn:ietf:params:xml:ns:EmergencyCallData:ServiceInfo . 79
11.5.4. Registration for
urn:ietf:params:xml:ns:EmergencyCallData:DeviceInfo . . 80
11.5.5. Registration for
urn:ietf:params:xml:ns:EmergencyCallData:SubscriberInfo 81
11.5.6. Registration for
urn:ietf:params:xml:ns:EmergencyCallData:Comment . . . 81
11.6. Schema Registrations . . . . . . . . . . . . . . . . . . 82
11.7. vCard Parameter Value Registration . . . . . . . . . . . 83
12. References . . . . . . . . . . . . . . . . . . . . . . . . . 84
12.1. Normative References . . . . . . . . . . . . . . . . . . 84
12.2. Informative References . . . . . . . . . . . . . . . . . 85
Appendix A. XML Schema for vCard/xCard . . . . . . . . . . . . . 89
Appendix B. XML Validation . . . . . . . . . . . . . . . . . . . 111
Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . 112
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 113
1. Introduction
When an IP-based emergency call is initiated, a rich set of data from
multiple data sources is conveyed to the Public Safety Answering
Point (PSAP). This data includes information about the calling party
identity, the multimedia capabilities of the device, the request for
emergency services, location information, and metadata about the
sources of the data. In addition, the device, the access network
provider, and any service provider in the call path has even more
information that is useful for a PSAP when handling an emergency.
This document extends the basic set of data communicated with an
emergency call based on the Session Initiation Protocol (SIP), as
described in RFC 6443 [RFC6443] and RFC 6881 [RFC6881], in order to
carry additional data that is useful to an entity or call taker
handling the call. This data is "additional" to the basic
information found in the emergency call signaling used. The intent
is that every emergency call carry as much of the information
described here as possible using the mechanisms described here.
Gellens, et al. Standards Track [Page 4]
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This document defines three categories of this additional data that
can be transmitted with an emergency call:
Data Associated with a Location: Primary location data is conveyed
in the Presence Information Data Format Location Object (PIDF-LO)
data structure as defined in RFC 4119 [RFC4119] and extended by
RFC 5139 [RFC5139] and RFC 6848 [RFC6848] (for civic location
information), RFC 5491 [RFC5491] and RFC 5962 [RFC5962] (for
geodetic location information), and RFC 7035 [RFC7035] (for
relative location). This primary location data identifies the
location or estimated location of the caller. However, there
might exist additional, secondary data that is specific to the
location, such as floor plans, tenant and building owner contact
data, heating, ventilation, and air conditioning (HVAC) status,
etc. Such secondary location data is not included in the location
data structure but can be transmitted using the mechanisms defined
in this document. Although this document does not define any
structures for such data, future documents can do so following the
procedures defined here.
Data Associated with a Call: While some information is carried in
the call setup procedure itself (as part of the SIP headers as
well as in the body of the SIP message), there is additional data
known by the device making the call, the access network to which
the device is connected, and service providers along the path of
the call. This information includes service provider contact
information, subscriber identity and contact information, the type
of service the service provider and the access network provide,
what type of device is being used, etc. Some data is broadly
applicable, while other data is dependent on the type of device or
service. For example, a medical monitoring device might have
sensor data. The data structures defined in this document (Data
Provider Information, Device Information, and Owner/Subscriber
Information) all fall into the category of "Data Associated with a
Call". Note that the owner/subscriber information includes the
subscriber's vCard, which might contain personal information such
as birthday, anniversary, etc., but the data block itself is still
considered to be about the call, not the caller.
Data Associated with a Caller: This is personal data about a caller,
such as medical information and emergency contact data. Although
this document does not define any structures within this category,
future documents can do so following the procedures defined here.
While this document defines data structures only within the category
of Data Associated with a Call, by establishing the overall framework
of Additional Data, along with general mechanisms for transport of
such data, extension points, and procedures for future extensions, it
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RFC 7852 Additional Call Data July 2016
minimizes the work needed to carry data in the other categories.
Other specifications can make use of the facilities provided here.
For interoperability, there needs to be a common way for the
information conveyed to a PSAP to be encoded and identified.
Identification allows emergency services authorities to know during
call processing which types of data are present and to determine if
they wish to access it. A common encoding allows the data to be
successfully accessed.
This document defines an extensible set of data structures, and
mechanisms to transmit this data either by value or by reference,
either in the SIP call signaling or in the PIDF-LO. The data
structures are usable by other communication systems and transports
as well. The data structures are defined in Section 4, and the
transport mechanisms (using SIP and HTTPS) are defined in Section 6.
Each data structure described in this document is encoded as a
"block" of information. Each block is an XML structure with an
associated Multipurpose Internet Mail Extensions (MIME) media type
for identification within transport such as SIP and HTTPS. The set
of blocks is extensible. Registries are defined to identify the
block types that can be used and to allow blocks to be included in
emergency call signaling.
Much of the information supplied by service providers and devices is
private and confidential. Service providers and devices generally go
to lengths to protect this information; disclosing it in the context
of an emergency call is a trade-off to protect the greater interest
of the customer in an emergency.
2. Terminology
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [RFC2119].
This document also uses terminology from [RFC5012]. We use the term
"service provider" to refer to an Application Service Provider (ASP).
A Voice Service Provider (VSP) is a special type of ASP. With the
term "Access Network Provider", we refer to the Internet Access
Provider (IAP) and the Internet Service Provider (ISP) without
further distinguishing these two entities, since the difference
between the two is not relevant for this document. Note that the
roles of an ASP and access network provider might be provided by a
single company. An Emergency Services Provider is an entity directly
involved in providing emergency services. This includes PSAPs,
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RFC 7852 Additional Call Data July 2016
dispatch, police, fire, emergency medical, other responders, and
other similar agencies.
Within each data block definition (see Section 4), the values for the
'Use:' label are specified as one of the following:
'Required': means it MUST be present in the data structure.
'Conditional': means it MUST be present if the specified
condition(s) is met. It MAY be present if the condition(s) is not
met.
'Optional': means it MAY be present.
vCard [RFC6350] is a data format for representing and exchanging a
variety of information about individuals and other entities. For
applications that use XML, the format defined in vCard is not
immediately applicable. For this reason, an XML-based encoding of
the information elements defined in the vCard specification has been
defined, and the name of that specification is xCard [RFC6351].
Since the term vCard is more familiar to most readers, we use the
terms xCard and vCard interchangeably.
3. Document Scope
The scope of this document is explicitly limited to emergency calls.
The data structures defined here are not appropriate to be conveyed
in non-emergency calls because they carry sensitive and private data.
However, in certain private-use situations between a specialized
service provider (such as a vehicle telematics service provider) and
dedicated equipment (such as in a vehicle) where the endpoints have a
preexisting relationship and privacy issues are addressed within the
relationship, the mechanisms and data structures defined here can be
used with communications within the limited context of the
preexisting relationship.
4. Data Structures
This section defines the following five data structures, each as a
data block. For each block, we define the MIME media type and the
XML encoding. The five data structures are:
'Data Provider': This block supplies name and contact information
for the entity that created the data. Section 4.1 provides the
details.
'Service Information': This block supplies information about the
service. The description can be found in Section 4.2.
Gellens, et al. Standards Track [Page 7]
RFC 7852 Additional Call Data July 2016
'Device Information': This block supplies information about the
device placing the call. Device information can be found in
Section 4.3.
'Owner/Subscriber': This block supplies information about the owner
of the device or about the subscriber. Details can be found in
Section 4.4.
'Comment': This block provides a way to supply free form human-
readable text to the PSAP or emergency responders. This simple
structure is defined in Section 4.5.
Each block contains a mandatory <DataProviderReference> element. The
purpose of the <DataProviderReference> element is to associate all
blocks added by the same data provider as a unit. The
<DataProviderReference> element associates the data provider block to
each of the other blocks added as a unit. Consequently, when a data
provider adds additional data to an emergency call (such as device
information), it MUST add information about itself (via the data
provider block), and the blocks added contain the same value in the
<DataProviderReference> element. All blocks added by a single entity
at the same time MUST have the same <DataProviderReference> value.
(In certain situations, the same provider might process a call more
than once, likely in different roles, and in such cases, each time it
processes the call, it adds a new set of blocks with a new
<DataProviderReference> value.) The value of the
<DataProviderReference> element has the same syntax and properties
(specifically, world-uniqueness) as the value of the 'Message-ID'
message body header field specified in RFC 5322 [RFC5322] except that
the <DataProviderReference> element is not enclosed in brackets (the
'<' and '>' symbols are omitted). In other words, the value of a
<DataProviderReference> element is syntactically a msg-id as
specified in RFC 5322 [RFC5322].
Each block is added to the "Additional Data Blocks" registry created
in Section 11.1.9 and categorized as providing data about the caller.
New blocks added to the registry in the future MUST also be
categorized per the description of the three categories in Section 1.
See Sections 5 and 5.1 for additional considerations when adding new
blocks or types of data.
Note that the xCard format is reused in some of the data structures
to provide contact information. In an xCard, there is no way to
specify a 'main' telephone number (that is, a primary or main contact
number, typically of an enterprise, as opposed to a direct-dial
number of an individual). These numbers are useful to emergency
responders who are called to a large enterprise. This document adds
a new parameter value called 'main-number' to the 'TYPE' parameter of
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RFC 7852 Additional Call Data July 2016
the 'tel' property. It can be used in any xCard in an emergency call
additional data block.
4.1. Data Provider Information
This block is intended to be supplied by any service provider in the
path of the call, or the access network provider, and the device. It
includes identification and contact information. This block MUST be
supplied by any entity that provides any other block; it SHOULD be
supplied by every service provider in the call path and by the access
network provider if those entities do not add any other blocks.
Devices SHOULD use this block to provide identifying information.
The MIME media type is 'application/
EmergencyCallData.ProviderInfo+xml'. An access network provider
SHOULD provide this block either by value or by reference in the
<provided-by> element of a PIDF-LO.
4.1.1. Data Provider String
Data Element: Data Provider String
Use: Conditional. Optional for blocks supplied by the originating
device; mandatory otherwise.
XML Element: <DataProviderString>
Description: This is a plaintext string suitable for displaying the
name of the service provider that supplied the data structure. If
the device creates the structure, it SHOULD use the value of the
contact header field in the SIP INVITE.
Reason for Need: Inform the call taker of the identity of the entity
providing the data.
How Used by Call Taker: Allows the call taker to interpret the data
in this structure. The source of the information often influences
how the information is used, believed, or verified.
4.1.2. Data Provider ID
Data Element: Data Provider ID
Use: Conditional. Optional for blocks supplied by the originating
device; mandatory otherwise. This data MUST be provided by all
entities other than the originating device in order to uniquely
identify the service provider or access provider.
XML Element: <ProviderID>
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Description: A jurisdiction-specific code for, or the fully
qualified domain name of, the access network provider or service
provider shown in the <DataProvidedBy> element that created the
structure. NOTE: The value SHOULD be assigned by an organization
appropriate for the jurisdiction. In the United States, if the
provider is registered with NENA, the provider's NENA Company ID
MUST appear here. Additional information can be found at the
National Emergency Number Association (NENA) Company Identifier
Program <http://www.nena.org/?page=cid2014> or the NENA Company ID
<http://www.nena.org/?page=CompanyID>. The NENA Company ID MUST
be in the form of a URI in the following format:
urn:nena:companyid:<NENA Company ID>. If the organization does
not have an identifier registered with a jurisdiction-specific
emergency services registrar (such as NENA), then the value MAY be
the fully qualified domain name of the service provider or access
provider. The device MAY use its IP address or fully qualified
domain name (and set the 'Data Provider ID Series' element to
'domain').
Reason for Need: Inform the call taker of the identity of the entity
providing the data.
How Used by Call Taker: Where jurisdictions have lists of providers,
the Data Provider ID provides useful information about the data
source. The Data Provider ID uniquely identifies the source of
the data, which might be needed especially during unusual
circumstances and for routine logging.
4.1.3. Data Provider ID Series
Data Element: Data Provider ID Series
Use: Conditional. Optional for blocks supplied by the originating
device; mandatory otherwise.
XML Element: <ProviderIDSeries>
Description: Identifies the issuer of the <ProviderID>. The
"Provider ID Series" registry created in Section 11.1.1 initially
contains the entries shown in Figure 1.
Reason for Need: Identifies how to interpret the Data Provider ID.
The combination of ProviderIDSeries and ProviderID MUST be
globally unique.
How Used by Call Taker: Determines which provider ID registry to
consult for more information.
Gellens, et al. Standards Track [Page 10]
RFC 7852 Additional Call Data July 2016
+-----------+--------------------------+----------------------+
| Name | Source | URL |
+-----------+--------------------------+----------------------+
| NENA | National Emergency | http://www.nena.org |
| | Number Association | |
| | | |
| EENA | European Emergency | http://www.eena.org |
| | Number Association | |
| | | |
| domain | (The ID is a fully | (not applicable) |
| | qualified domain name) | |
+-----------+--------------------------+----------------------+
Figure 1: Provider ID Series Registry
4.1.4. Type of Data Provider
Data Element: Type of Data Provider
Use: Required
XML Element: <TypeOfProvider>
Description: Identifies the type of data provider supplying the
data. The registry containing all valid values is created in
Section 11.1.5, and the initial set of values is shown in
Figure 2.
Reason for Need: Identifies the category of data provider.
How Used by Call Taker: This information can be helpful when
deciding whom to contact when further information is needed.
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RFC 7852 Additional Call Data July 2016
+------------------------------+------------------------------------+
| Token | Description |
+------------------------------+------------------------------------+
|Client | Originating client/device |
| | |
|Access Network Provider | Access network service provider |
| | |
|Telecom Provider | Telecom service provider (including|
| | native and over-the-top VoIP |
| | services) |
| | |
|Telematics Provider | A sensor-based service provider, |
| | especially vehicle based |
| | |
|Language Translation Provider | A spoken language translation |
| | service |
| | |
|Emergency Service Provider | An emergency service provider |
| | conveying information to another|
| | emergency service provider |
| | |
|Emergency Modality Translation| An emergency-call-specific |
| | modality translation service, |
| | e.g., for sign language |
| | |
|Relay Provider | An interpretation service, e.g., |
| | video relay for sign language |
| | interpretation |
| | |
|Other | Any other type of service provider |
+------------------------------+------------------------------------+
Figure 2: Type of Data Provider Registry
4.1.5. Data Provider Contact URI
Data Element: Data Provider Contact URI
Use: Required
XML Element: <ContactURI>
Description: When provided by a service provider or an access
network provider, this information is expected to be a URI to a
24/7 support organization tasked to provide PSAP support for this
emergency call. When provided by a device, this MUST be the
contact information of the user or owner of the device. (Ideally,
this is the contact information of the device user, but when the
Gellens, et al. Standards Track [Page 12]
RFC 7852 Additional Call Data July 2016
owner and user are separate (e.g., the device owner is an
organization), this MAY be the contact information of the owner.)
The Data Provider Contact URI SHOULD be a tel URI [RFC3966] in
E.164 format and fully specified with a country code. If a tel
URI is not available, a generic SIP URI is acceptable. Note that
this contact information is not used by PSAPs for callbacks (a
call from a PSAP directly related to a recently terminated
emergency call, placed by the PSAP using a SIP Priority header
field set to 'psap-callback', as described in [RFC7090]).
Reason for Need: Additional data providers might need to be
contacted in error cases or other unusual circumstances.
How Used by Call Taker: To contact the supplier of the additional
data for assistance in handling the call.
4.1.6. Data Provider Language(s) Supported
Data Element: Data Provider Language(s) supported
Use: Required
XML Element: <Language>
Description: This field encodes the language used by the entity at
the Data Provider Contact URI. The content of this field consists
of a single token from the Language Subtag Registry, which can be
found at [LanguageSubtagRegistry], and is defined in [RFC5646].
Multiple instances of this element MAY occur, but the order is
significant and the preferred language SHOULD appear first. The
content MUST reflect the languages supported at the contact URI.
(Note that this field informs the PSAP of the language(s) used by
the data provider. If the PSAP needs to contact the data
provider, it can be helpful to know in advance the language(s)
used by the data provider. If the PSAP uses a communication
protocol to reach the data provider, that protocol might have
language facilities of its own (such as the 'language' media
feature tag, defined in RFC 3840 [RFC3840], and the more extensive
language negotiation mechanism proposed in [HUMAN-LANG]), and if
so, those are independent of this field.)
Reason for Need: This information indicates if the emergency service
authority can directly communicate with the service provider or if
an interpreter will be needed.
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How Used by Call Taker: If the call taker cannot speak any language
supported by the service provider, a translation service will need
to be added to the conversation. Alternatively, other persons at
the PSAP, besides the call taker, might be consulted for help
(depending on the urgency and the type of interaction).
4.1.7. xCard of Data Provider
Data Element: xCard of Data Provider
Use: Optional
XML Element: <DataProviderContact>
Description: Per [RFC6351], the xCard structure is represented
within a <vcard> element. Although multiple <vcard> elements can
be contained in a structure, only one <vcard> element SHOULD be
provided. If more than one appears, the first SHOULD be used.
There are many fields in the xCard, and the creator of the data
structure is encouraged to provide all available information. N,
ORG, ADR, TEL, and EMAIL are suggested at a minimum. N SHOULD
contain the name of the support group or device owner as
appropriate. If more than one TEL property is provided, a
parameter from the "vCard Property Values" registry SHOULD be
specified for each TEL. For encoding of the vCard, this
specification uses the XML-based encoding specified in [RFC6351],
which is referred to in this document as 'xCard'.
Reason for Need: Information needed to determine additional contact
information.
How Used by Call Taker: Assists the call taker by providing
additional contact information aside from what is included in the
SIP INVITE or the PIDF-LO.
4.1.8. Subcontractor Principal
When the entity providing the data is a subcontractor, the Data
Provider Type is set to that of the primary service provider, and
this entry is supplied to provide information regarding the
subcontracting entity.
Data Element: Subcontractor Principal
Use: Conditional. This data is required if the entity providing the
data is a subcontractor.
XML Element: <SubcontractorPrincipal>
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Description: Some providers outsource their obligations to handle
aspects of emergency services to specialized providers. If the
data provider is a subcontractor to another provider, this element
contains the DataProviderString of the service provider to
indicate which provider the subcontractor is working for.
Reason for Need: Identify the entity the subcontractor works for.
How Used by Call Taker: Allows the call taker to understand what the
relationship is between data providers and the service providers
in the path of the call.
4.1.9. Subcontractor Priority
Data Element: Subcontractor Priority
Use: Conditional. This data is required if the entity providing the
data is a subcontractor.
XML Element: <SubcontractorPriority>
Description: If the subcontractor is supposed to be contacted first,
then this element MUST have the value 'sub'. If the provider the
subcontractor is working for is supposed to be contacted first,
then this element MUST have the value 'main'.
Reason for Need: Inform the call taker whom to contact first, if
support is needed.
How Used by Call Taker: To decide which entity to contact first if
assistance is needed.
4.1.10. ProviderInfo Example
<?xml version="1.0" encoding="UTF-8"?>
<ad:EmergencyCallData.ProviderInfo
xmlns:ad="urn:ietf:params:xml:ns:EmergencyCallData:ProviderInfo">
<ad:DataProviderReference>string0987654321@example.org
</ad:DataProviderReference>
<ad:DataProviderString>Example VoIP Provider
</ad:DataProviderString>
<ad:ProviderID>urn:nena:companyid:ID123</ad:ProviderID>
<ad:ProviderIDSeries>NENA</ad:ProviderIDSeries>
<ad:TypeOfProvider>Telecom Provider</ad:TypeOfProvider>
<ad:ContactURI>tel:+1-201-555-0123</ad:ContactURI>
<ad:Language>en</ad:Language>
<ad:DataProviderContact
xmlns="urn:ietf:params:xml:ns:vcard-4.0">
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<vcard>
<fn><text>Hannes Tschofenig</text></fn>
<n>
<surname>Hannes</surname>
<given>Tschofenig</given>
<additional/>
<prefix/>
<suffix>Dipl. Ing.</suffix>
</n>
<bday><date>--0203</date></bday>
<anniversary>
<date-time>20090808T1430-0500</date-time>
</anniversary>
<gender><sex>M</sex></gender>
<lang>
<parameters><pref><integer>1</integer></pref>
</parameters>
<language-tag>de</language-tag>
</lang>
<lang>
<parameters><pref><integer>2</integer></pref>
</parameters>
<language-tag>en</language-tag>
</lang>
<org>
<parameters><type><text>work</text></type>
</parameters>
<text>Example VoIP Provider</text>
</org>
<adr>
<parameters>
<type><text>work</text></type>
<label><text>Hannes Tschofenig
Linnoitustie 6
Espoo , Finland
02600</text></label>
</parameters>
<pobox/>
<ext/>
<street>Linnoitustie 6</street>
<locality>Espoo</locality>
<region>Uusimaa</region>
<code>02600</code>
<country>Finland</country>
</adr>
<tel>
<parameters>
<type>
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<text>work</text>
<text>voice</text>
</type>
</parameters>
<uri>tel:+358 50 4871445</uri>
</tel>
<tel>
<parameters>
<type>
<text>work</text>
<text>main-number</text>
<text>voice</text>
</type>
</parameters>
<uri>tel:+358 50 5050505</uri>
</tel>
<email>
<parameters><type><text>work</text></type>
</parameters>
<text>hannes.tschofenig@nsn.com</text>
</email>
<geo>
<parameters><type><text>work</text></type>
</parameters>
<uri>geo:60.210796,24.812924</uri>
</geo>
<key>
<parameters><type><text>home</text></type>
</parameters>
<uri>
http://www.example.com/key.asc
</uri>
</key>
<tz><text>Finland/Helsinki</text></tz>
<url>
<parameters><type><text>home</text></type>
</parameters>
<uri>http://www.tschofenig.priv.at</uri>
</url>
</vcard>
</ad:DataProviderContact>
</ad:EmergencyCallData.ProviderInfo>
Figure 3: EmergencyCallData.ProviderInfo Example
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4.2. Service Information
This block describes the service that the service provider provides
to the caller. It SHOULD be included by all service providers in the
path of the call. The MIME media type is 'application/
EmergencyCallData.ServiceInfo+xml'.
4.2.1. Service Environment
Data Element: Service Environment
Use: Conditional. Required unless the 'ServiceType' value is
'wireless'.
XML Element: <ServiceEnvironment>
Description: This element indicates whether a call is from a
business or residence. Currently, the only valid entries are
'Business', 'Residence', and 'Unknown', as shown in Figure 4. New
values can be defined via the registry created in Section 11.1.2.
Reason for Need: To provide context and a hint when determining
equipment and manpower requirements.
How Used by Call Taker: Information can be used to provide context
and a hint to assist in determining equipment and manpower
requirements for emergency responders. This is non-authoritative;
there are situations where the service provider does not know the
type of service (e.g., anonymous prepaid service). The type of
service does not necessarily reflect the nature of the premises
(e.g., a business line installed in a residence or cellular
service). The registry does not contain all possible values for
all situations. Hence, this is at best advisory information, but
since it mimics a similar capability in some current emergency
calling systems (e.g., a field in the Automatic Location
Information (ALI) used with legacy North American wireline
systems), it is known to be valuable to PSAPs. The service
provider uses its best information (such as a rate plan,
facilities used to deliver service, or a service description) to
determine the information and is not responsible for determining
the actual characteristics of the location from which the call
originated. Because the usefulness is unknown (and less clear)
for cellular, this element is OPTIONAL for commercial mobile radio
services (e.g., cellular) and REQUIRED otherwise.
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+-----------+--------------------------+
| Token | Description |
+-----------+--------------------------+
| Business | Business service |
| | |
| Residence | Residential service |
| | |
| Unknown | Type of service unknown |
| | (e.g., anonymous pre- |
| | paid service) |
+-----------+--------------------------+
Figure 4: Service Environment Registry
4.2.2. Service Type
Data Element: Service Delivered by Provider to End User
Use: Required
XML Element: <ServiceType>
Description: This defines the type of service over which the call is
placed (similar to the Class of Service delivered with legacy
emergency calls in some regions). The implied mobility of this
service cannot be relied upon. A registry is created in
Section 11.1.3. The initial set of values is shown in Figure 5.
More than one value MAY be returned. For example, a VoIP inmate
telephone service is a reasonable combination.
Reason for Need: Knowing the type of service can assist the PSAP in
the handling of the call.
How Used by Call Taker: Call takers often use this information to
determine what kinds of questions to ask callers and how much to
rely on supportive information. As the information is not always
available, and the registry is not all encompassing, this is at
best advisory information, but since it mimics a similar
capability in some legacy emergency calling systems, it is known
to be valuable.
+--------------+------------------------------------------+
| Name | Description |
+--------------+------------------------------------------+
| wireless | Wireless Telephone Service: Includes |
| | CDMA, GSM, Wi-Fi, WiMAX, and LTE |
| | (but not satellite) |
| | |
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| coin | Fixed public pay/coin telephones: Any |
| | device operated by coin or credit card |
| | |
| one-way | One-way outbound service |
| | |
| temp | Soft dial tone/quick service/warm |
| | disconnect/suspended |
| | |
| MLTS-hosted | Hosted multi-line telephone system |
| | such as Centrex |
| | |
| MLTS-local | Local multi-line telephone system, |
| | including all PBXs, key systems, and |
| | Shared Tenant Services |
| | |
| sensor- | These are devices that generate DATA |
| unattended | ONLY. This is a one-way information |
| | transmit without interactive media. |
| | |
| sensor- | Devices that are supported by a |
| attended | monitoring service provider or that |
| | are capable of supporting interactive |
| | media |
| | |
| POTS | Wireline: Plain Old Telephone Service |
| | |
| OTT | An over-the-top service that provides |
| | communication over arbitrary Internet |
| | access (fixed, nomadic, mobile) |
| | |
| digital | Wireline non-OTT digital phone service |
| | |
| OPX | Off-premise extension |
| | |
| relay | A service where a human third-party |
| | agent provides additional assistance. |
| | This includes sign language relay/ |
| | interpretation, telematics services |
| | that provide a human on the call, |
| | and similar services. |
+--------------+------------------------------------------+
Figure 5: Service Delivered by Provider to End User Registry
The initial set of values has been collected from sources of
currently used systems, including [NENA-02-010], [nc911], [NANP], and
[LERG].
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4.2.3. Service Mobility Environment
Data Element: Service Mobility Environment
Use: Required
XML Element: <ServiceMobility>
Description: This provides the service provider's view of the
mobility of the caller's device. As the service provider might
not know the characteristics of the actual device or access
network used, the value should be treated as advisory and not be
relied upon. A registry is created in Section 11.1.4 with the
initial valid entries shown in Figure 6.
Reason for Need: Knowing the service provider's belief of mobility
can assist the PSAP with the handling of the call.
How Used by Call Taker: To determine whether to assume the location
of the caller might change.
+-----------+----------------------------+
| Token | Description |
+-----------+----------------------------+
| Mobile | The device is able to move |
| | at any time |
| | |
| Fixed | The device is not expected |
| | to move unless the |
| | service is relocated |
| | |
| Nomadic | The device is not expected |
| | to change its point of |
| | attachment while on a |
| | call |
| | |
| Unknown | No information is known |
| | about the service |
| | mobility environment for |
| | the device |
+-----------+----------------------------+
Figure 6: Service Mobility Registry
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4.2.4. EmergencyCallData.ServiceInfo Example
<?xml version="1.0" encoding="UTF-8"?>
<svc:EmergencyCallData.ServiceInfo
xmlns:svc="urn:ietf:params:xml:ns:EmergencyCallData:ServiceInfo">
<svc:DataProviderReference>2468.IBOC.MLTS.1359@example.org
</svc:DataProviderReference>
<svc:ServiceEnvironment>Business</svc:ServiceEnvironment>
<svc:ServiceType>MLTS-hosted</svc:ServiceType>
<svc:ServiceMobility>Fixed</svc:ServiceMobility>
</svc:EmergencyCallData.ServiceInfo>
Figure 7: EmergencyCallData.ServiceInfo Example
4.3. Device Information
This block provides information about the device used to place the
call. It SHOULD be provided by any service provider that knows what
device is being used and by the device itself. The MIME media type
is 'application/EmergencyCallData.DeviceInfo+xml'.
4.3.1. Device Classification
Data Element: Device Classification
Use: Optional
XML Element: <DeviceClassification>
Description: This data element defines the kind of device making the
emergency call. If the device provides the data structure, the
device information SHOULD be provided. If the service provider
provides the structure and it knows what the device is, the
service provider SHOULD provide the device information. Often the
carrier does not know what the device is. It is possible to
receive two Device Information blocks: one provided by the device
and one from the service provider. This information describes the
device, not how it is being used. This data element defines the
kind of device making the emergency call. A registry is created
in Section 11.1.6 with the initial set of values as shown in
Figure 8.
Reason for Need: The device classification implies the capability of
the calling device and assists in identifying the meaning of the
emergency call location information that is being presented. For
example, does the device require human intervention to initiate a
call, or is this call the result of programmed instructions? Does
the calling device have the ability to update location or
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condition changes? Is this device interactive or a one-way
reporting device?
How Used by Call Taker: Can provide the call taker context regarding
the caller, the capabilities of the calling device, or the
environment in which the device is being used and can assist in
understanding the location information and capabilities of the
calling device. For example, a cordless handset might be outside
or next door.
+---------------+----------------------------------------+
| Token | Description |
+---------------+----------------------------------------+
|cordless | Cordless handset |
|fixed | Fixed phone |
|satellite | Satellite phone |
|sensor-fixed | Fixed (non-mobile) sensor/alarm device |
|desktop | Soft client on desktop PC |
|laptop | Soft client on laptop-type device |
|tablet | Soft client on tablet-type device |
|alarm-monitored| Alarm system |
|sensor-mobile | Mobile sensor device |
|aircraft | Aircraft telematics device |
|automobile | Automobile/cycle/off-road telematics |
|truck | Truck/construction telematics |
|farm | Farm equipment telematics |
|marine | Marine telematics |
|personal | Personal telematics device |
|feature-phone | Cellular feature phone (not smartphone)|
|smart-phone | Cellular smartphone (native) |
|smart-phone-app| Soft client app on smartphone |
|unknown-device | Soft client on unknown device type |
|game | Gaming console |
|text-only | Other text device |
|NA | Not Available |
+---------------+----------------------------------------+
Figure 8: Device Classification Registry Initial Values
4.3.2. Device Manufacturer
Data Element: Device Manufacturer
Use: Optional
XML Element: <DeviceMfgr>
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Description: The plain language name of the manufacturer of the
device.
Reason for Need: Used by PSAP management for post-mortem
investigation/resolution.
How Used by Call Taker: Probably not used by the call taker but by
PSAP management.
4.3.3. Device Model Number
Data Element: Device Model Number
Use: Optional
XML Element: <DeviceModelNr>
Description: Model number of the device.
Reason for Need: Used by PSAP management for after-action
investigation/resolution.
How Used by Call Taker: Probably not used by the call taker but by
PSAP management.
4.3.4. Unique Device Identifier
Data Element: Unique Device Identifier
Use: Optional
XML Element: <UniqueDeviceID>
XML Attribute: <TypeOfDeviceID>
Description: A string that identifies the specific device (or the
device's current Subscriber Identification Module (SIM)) making
the call or creating an event. Note that more than one
<UniqueDeviceID> can be present to supply more than one of the
identifying values.
The <TypeOfDeviceID> attribute identifies the type of device
identifier. A registry is created in Section 11.1.7 with an
initial set of values shown in Figure 9.
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Reason for Need: Uniquely identifies the device (or, in the case of
International Mobile Subscriber Identity (IMSI), a SIM),
independent of any signaling identifiers present in the call
signaling stream.
How Used by Call Taker: Probably not used by the call taker; might
be used by PSAP management during an investigation. (For example,
if a PSAP experiences repeated false/accidental calls and there is
no callback number or it isn't usable, the PSAP might need to try
to track down the device using various means, e.g., contacting
service providers in the area.) In the case of handsets without
current service, it might be possible to determine who last had
service. Another example might be a disconnected call where the
call taker believes there is a need for assistance but was not
able to obtain a location or other information.
Example: <UniqueDeviceID TypeOfDeviceID="SN">12345</UniqueDeviceID>
+--------+------------------------------------------+
| Token | Description |
+--------+------------------------------------------+
| MEID | Mobile Equipment Identifier (CDMA) |
| ESN | Electronic Serial Number (GSM) |
| MAC | Media Access Control Address (IEEE) |
| WiMAX | Device Certificate Unique ID |
| IMEI | International Mobile Equipment ID (GSM) |
| IMSI | International Mobile Subscriber ID (GSM) |
| UDI | Unique Device Identifier |
| RFID | Radio Frequency Identification |
| SN | Manufacturer Serial Number |
+--------+------------------------------------------+
Figure 9: Registry of Device Identifier Types
4.3.5. Device/Service-Specific Additional Data Structure
Data Element: Device/service-specific additional data structure
Use: Optional
XML Element: <DeviceSpecificData>
Description: A URI representing additional data whose schema is
specific to the device or service that created it. (For example,
a medical device or medical device monitoring service might have a
defined set of medical data.) The URI, when dereferenced, MUST
yield a data structure defined by the device/service-specific
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additional data type value. Different data can be created by each
classification, e.g., a data set created by a medical device.
Reason for Need: Provides device/service-specific data that can be
used by the call taker and/or responders.
How Used by Call Taker: Provide information to guide call takers to
select appropriate responders, give appropriate pre-arrival
instructions to callers, and advise responders of what to be
prepared for. May be used by responders to guide assistance
provided.
4.3.6. Device/Service-Specific Additional Data Structure Type
Data Element: Type of device/service-specific additional data
structure
Use: Conditional. MUST be provided when a device/service-specific
additional data URI is provided.
XML Element: <DeviceSpecificType>
Description: A value from the registry defined in Section 11.1.8 to
describe the type of data located at the device/service-specific
additional data structure. The initial values shown in Figure 10
currently only include IEEE 1512, which is the United States
Department of Transportation (USDoT) model for traffic incidents.
Reason for Need: This data element allows identification of
externally defined schemas, which might have additional data that
can assist in emergency response.
How Used by Call Taker: This data element allows the end user (call
taker or first responder) to know what type of additional data is
available to aid in providing the needed emergency services.
Note: This mechanism is not appropriate for information specific to
a location or a caller (person).
+---------+---------------------------+--------------------------+
| Token | Description | Specification |
+---------+---------------------------+--------------------------+
|IEEE1512 |Common Incident Management | IEEE 1512-2006 |
| | Message Set (USDoT model | |
| | for traffic incidents) | |
+---------+---------------------------+--------------------------+
Figure 10: Device/Service Data Type Registry
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The IEEE 1512-2006 specifications can be found at [IEEE-1512-2006].
4.3.7. EmergencyCallData.DeviceInfo Example
<?xml version="1.0" encoding="UTF-8"?>
<dev:EmergencyCallData.DeviceInfo
xmlns:dev="urn:ietf:params:xml:ns:EmergencyCallData:DeviceInfo">
<dev:DataProviderReference>d4b3072df.201409182208075@example.org
</dev:DataProviderReference>
<dev:DeviceClassification>fixed</dev:DeviceClassification>
<dev:DeviceMfgr>Nokia</dev:DeviceMfgr>
<dev:DeviceModelNr>Lumia 800</dev:DeviceModelNr>
<dev:UniqueDeviceID TypeOfDeviceID="IMEI">35788104
</dev:UniqueDeviceID>
</dev:EmergencyCallData.DeviceInfo>
Figure 11: EmergencyCallData.DeviceInfo Example
4.4. Owner/Subscriber Information
This block describes the owner of the device (if provided by the
device) or the subscriber information (if provided by a service
provider). The contact location is not necessarily the location of
the caller or incident but is rather the nominal contact address.
The MIME media type is 'application/
EmergencyCallData.SubscriberInfo+xml'.
In some jurisdictions, some or all parts of the subscriber-specific
information are subject to privacy constraints. These constraints
vary but dictate which information can be displayed and logged. A
general privacy indicator expressing a desire for privacy by the
subscriber is provided. The interpretation of how this is applied is
left to the receiving jurisdiction as the custodians of the local
regulatory requirements. This matches an equivalent privacy flag
provided in some legacy emergency call systems.
4.4.1. Subscriber Data Privacy Indicator
Attribute: 'privacyRequested', Boolean.
Use: Conditional. This attribute MUST be provided if the owner/
subscriber information block is not empty.
Description: The subscriber data privacy indicator specifically
expresses the subscriber's desire for privacy. In some
jurisdictions, subscriber services can have a specific "Type of
Service" that prohibits information, such as the name of the
subscriber, from being displayed. This attribute is provided to
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explicitly indicate whether the subscriber service includes such
constraints. The interpretation of this indicator is left to each
jurisdiction (in keeping with the semantics of the privacy
indicator provided in some legacy emergency call systems).
Because the interpretation of this indicator varies based on local
regulations, this document cannot describe the exact semantics nor
indicate which fields are affected (the application of this
indicator might affect the display of data contained in any of the
blocks).
Reason for Need: Some jurisdictions require subscriber privacy to be
observed when processing emergency calls.
How Used by Call Taker: Where privacy is indicated, the call taker
might not have access to some aspects of the subscriber
information.
4.4.2. xCard for Subscriber's Data
Data Element: xCard for Subscriber's Data
Use: Conditional. Subscriber data MUST be provided unless it is not
available. Some services, such as prepaid phones, non-initialized
phones, etc., do not have information about the subscriber.
XML Element: <SubscriberData>
Description: Information known by the service provider or device
about the subscriber, e.g., Name, Address, Individual Telephone
Number, Main Telephone Number, and any other data. <n>, <org> (if
appropriate), <adr>, <tel>, and <email> are suggested at a
minimum. If more than one <tel> property is provided, a parameter
from the "vCard Property Values" registry MUST be specified on
each <tel>. While some data (such as <anniversary>) might not
seem obviously relevant for emergency services, any data is
potentially useful in some emergency circumstances.
Reason for Need: When the caller is unable to provide information,
this data can be used to obtain it.
How Used by Call Taker: Obtaining critical information about the
caller and possibly the location when it is not able to be
obtained otherwise. While the location here is not necessarily
that of a caller, in some circumstances it can be helpful in
locating the caller when other means have failed.
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4.4.3. EmergencyCallData.SubscriberInfo Example
<?xml version="1.0" encoding="UTF-8"?>
<sub:EmergencyCallData.SubscriberInfo
xmlns:sub=
"urn:ietf:params:xml:ns:EmergencyCallData:SubscriberInfo"
privacyRequested="false">
<sub:DataProviderReference>FEABFECD901@example.org
</sub:DataProviderReference>
<sub:SubscriberData xmlns="urn:ietf:params:xml:ns:vcard-4.0">
<vcard>
<fn><text>Simon Perreault</text></fn>
<n>
<surname>Perreault</surname>
<given>Simon</given>
<additional/>
<prefix/>
<suffix>ing. jr</suffix>
<suffix>M.Sc.</suffix>
</n>
<bday><date>--0203</date></bday>
<anniversary>
<date-time>20090808T1430-0500</date-time>
</anniversary>
<gender><sex>M</sex></gender>
<lang>
<parameters><pref><integer>1</integer></pref>
</parameters>
<language-tag>fr</language-tag>
</lang>
<lang>
<parameters><pref><integer>2</integer></pref>
</parameters>
<language-tag>en</language-tag>
</lang>
<org>
<parameters><type><text>work</text></type>
</parameters>
<text>Viagenie</text>
</org>
<adr>
<parameters>
<type><text>work</text></type>
<label><text>Simon Perreault
2875 boul. Laurier, suite D2-630
Quebec, QC, Canada
G1V 2M2</text></label>
</parameters>
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RFC 7852 Additional Call Data July 2016
<pobox/>
<ext/>
<street>2875 boul. Laurier,
suite D2-630</street>
<locality>Quebec</locality>
<region>QC</region>
<code>G1V 2M2</code>
<country>Canada</country>
</adr>
<tel>
<parameters>
<type>
<text>work</text>
<text>voice</text>
</type>
</parameters>
<uri>tel:+1-418-656-9254;ext=102</uri>
</tel>
<tel>
<parameters>
<type>
<text>work</text>
<text>voice</text>
<text>main-number</text>
</type>
</parameters>
<uri>tel:+1-418-555-0000</uri>
</tel>
<tel>
<parameters>
<type>
<text>work</text>
<text>text</text>
<text>voice</text>
<text>cell</text>
<text>video</text>
</type>
</parameters>
<uri>tel:+1-418-262-6501</uri>
</tel>
<email>
<parameters><type><text>work</text></type>
</parameters>
<text>simon.perreault@viagenie.ca</text>
</email>
<geo>
<parameters><type><text>work</text></type>
</parameters>
Gellens, et al. Standards Track [Page 30]
RFC 7852 Additional Call Data July 2016
<uri>geo:46.766336,-71.28955</uri>
</geo>
<key>
<parameters><type><text>work</text></type>
</parameters>
<uri>
http://www.viagenie.ca/simon.perreault/simon.asc
</uri>
</key>
<tz><text>America/Montreal</text></tz>
<url>
<parameters><type><text>home</text></type>
</parameters>
<uri>http://nomis80.org</uri>
</url>
</vcard>
</sub:SubscriberData>
</sub:EmergencyCallData.SubscriberInfo>
Figure 12: EmergencyCallData.SubscriberInfo Example
4.5. Comment
This block provides a mechanism for the data provider to supply
extra, human-readable information to the PSAP. It is not intended
for a general purpose extension mechanism nor does it aim to provide
machine-readable content. The MIME media type is 'application/
EmergencyCallData.Comment+xml'.
4.5.1. Comment
Data Element: EmergencyCallData.Comment
Use: Optional
XML Element: <Comment>
Description: Human-readable text providing additional information to
the PSAP staff.
Reason for Need: Explanatory information for values in the data
structure.
How Used by Call Taker: To interpret the data provided.
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4.5.2. EmergencyCallData.Comment Example
<?xml version="1.0" encoding="UTF-8"?>
<com:EmergencyCallData.Comment
xmlns:com="urn:ietf:params:xml:ns:EmergencyCallData:Comment">
<com:DataProviderReference>string0987654321@example.org
</com:DataProviderReference>
<com:Comment xml:lang="en">This is an example text.</com:Comment>
</com:EmergencyCallData.Comment>
Figure 13: EmergencyCallData.Comment Example
5. Issues with Getting New Types of Data into Use
This document describes two mechanisms that allow extension of the
kind of data provided with an emergency call: define a new block or
define a new device/service-specific additional data URL for the
DeviceInfo block (Section 4.3.5). While defining new data types and
getting a new device or application to send the new data might be
easy, getting PSAPs and responders to actually retrieve the data and
use it will be difficult. New mechanism providers should understand
that acquiring and using new forms of data usually require software
upgrades at the PSAP and/or responders, as well as training of call
takers and responders in how to interpret and use the information.
Legal and operational review might also be needed. Overwhelming a
call taker or responder with too much information is highly
discouraged. Thus, the barrier to supporting new data is quite high.
The mechanisms this document describes are meant to encourage
development of widely supported, common data formats for classes of
devices. If all manufacturers of a class of device use the same
format, and the data can be shown to improve outcomes, then PSAPs and
responders can be encouraged to upgrade their systems and train their
staff to use the data. Variations, however well intentioned, are
unlikely to be supported.
Implementors should consider that data from sensor-based devices in
some cases might not be useful to call takers or PSAPs (and privacy,
liability, or other considerations might preclude the PSAP from
accessing or handling the data) but might be of use to responders.
Each data item provided with the call in conformance with this
document can be accessed by responders or other entities in the
emergency services, whether or not the data is accessed by the PSAP.
Gellens, et al. Standards Track [Page 32]
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5.1. Choosing between Defining a New Type of Block or a New Type of
Device/Service-Specific Additional Data
For devices that have device- or service-specific data, there are two
choices to carry it. A new block can be defined, or the device/
service-specific additional data URL in the DeviceInfo block can be
used and a new type defined for it. The data passed would likely be
the same in either case. Considerations for choosing the mechanism
under which to register include:
Applicability: Information that will be supported by many kinds of
devices or services are more appropriately defined as separate
blocks.
Privacy: Information sent as a device/service-specific additional
data URL in the DeviceInfo block is by reference (not by value),
which inherently provides some additional privacy protection
(since the requester needs to supply a certificate which is
verified by the supplier).
Size: Information that can be very large might be better sent in the
DeviceInfo block, rather than in a new block, so that
implementations are unable to send the data by value. Conversely,
data that is small might best be sent in a separate block so that
it can be sent by value.
Availability of a server: Providing the data via the DeviceInfo
block requires that a server be available from which to retrieve
the data. Providing the data via a new block allows it to be sent
by value.
6. Data Transport Mechanisms
This section defines how to convey additional data to an emergency
service provider. Two different means are specified: the first uses
call signaling; the second uses the <provided-by> element of a PIDF-
LO [RFC4119].
1. First, the ability to embed a Uniform Resource Identifier (URI)
in an existing SIP header field, the Call-Info header field, is
defined. The URI points to the additional data structure. The
Call-Info header field is specified in Section 20.9 of [RFC3261].
This document adds a new compound token starting with the value
'EmergencyCallData' for the Call-Info 'purpose' parameter. If
the 'purpose' parameter is set to a value starting with
'EmergencyCallData', then the Call-Info header field contains
either an HTTPS URL pointing to an external resource or a Content
Gellens, et al. Standards Track [Page 33]
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Indirection (CID) URI that allows the data structure to be placed
in the body of the SIP message. The 'purpose' parameter also
indicates the kind of data (by its MIME media subtype) that is
available at the URI.
As the data is conveyed using a URI in the SIP signaling, the
data itself can reside on an external resource or can be
contained within the body of the SIP message. When the URI
refers to data at an external resource, the data is said to be
passed by reference. When the URI refers to data contained
within the body of the SIP message, the data is said to be passed
by value. A PSAP or emergency responder is able to examine the
type of data provided and selectively access the data it is
interested in, while forwarding all of it (the values or
references) to downstream entities.
To be conveyed in a SIP body, additional data about a call is
defined as a series of MIME objects (also referred to as a
"block" of data). Each block defined in this document is an XML
data structure identified by its MIME media type. (Blocks
defined by others can be encoded in XML or not, as identified by
their MIME registration.) As usual, whenever more than one MIME
part is included in the body of a message, MIME multipart (i.e.,
'multipart/mixed') encloses them all.
This document defines a set of XML schemas and MIME media types
used for each block defined here. When additional data is passed
by value in the SIP signaling, each CID URL points to one block
in the body. Multiple URIs are used within a Call-Info header
field (or multiple Call-Info header fields) to point to multiple
blocks. When additional data is provided by reference (in SIP
signaling or the <provided-by> element of a PIDF-LO), each HTTPS
URL references one block; the data is retrieved with an HTTPS GET
operation, which returns the block as an object (the blocks
defined here are returned as XML objects).
2. Second, the ability to embed additional data structures in the
<provided-by> element of a PIDF-LO [RFC4119] is defined.
In addition to service providers in the call path, the access
network provider generally has similar information that can be
valuable to the PSAP. When the access network provider and
service provider are separate entities, the access network does
not participate in the application-layer signaling (and hence
cannot add a Call-Info header field to the SIP message) but can
provide location information in a PIDF-LO. When the access
network provider supplies location information in the form of a
PIDF-LO from a location server via a location configuration
Gellens, et al. Standards Track [Page 34]
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protocol, it has the ability to add the data structures defined
in this document (or references to them) within the PIDF-LO.
The data in these data structures is not specific to the location
itself, but rather provides descriptive information having to do
with the immediate circumstances about the provider's provision
of the location (e.g., the identity of the access network
provider, how to contact that entity, what kind of service the
access network provides, subscriber information, etc.). This
data is similar in nearly every respect to the data known by
service providers in the path of the call. The <provided-by>
element of the PIDF-LO is a mechanism for the access network
provider to supply the information. This document describes a
namespace per [RFC4119] for inclusion in the <provided-by>
element of a PIDF-LO for adding information known to the access
network provider. The access network provider SHOULD provide
additional data within a <provided-by> element of a PIDF-LO it
returns for emergency use (e.g., if requested with an HTTP-
Enabled Location Delivery (HELD) 'responseTime' attribute of
'emergencyRouting' or 'emergencyDispatch' [RFC5985]).
One or more blocks of data registered in the "Emergency Call
Additional Data" registry, as defined in Section 11.1.9, can be
included or referenced in the SIP signaling (using the Call-Info
header field) or in the <provided-by> element of a PIDF-LO. For
interoperability, only blocks in the registry are permitted to be
sent using the mechanisms specified in this document. Since multiple
entities are expected to provide sets of data, the data itself needs
information describing the source. Consequently, each entity adding
additional data MUST supply a 'Data Provider' block. All other
blocks are optional, but each entity SHOULD supply all blocks where
it has at least some of the information in the block.
Note that, as with any mechanism, failures are possible. For
example, a block (provided by value or by reference) might not be the
type indicated by the 'purpose' parameter, or might be badly formed,
etc. The general principle that applies to emergency calls is that
it is more important for the call to go through than for everything
to be correct. Thus, most PSAPs will process a call if at all
possible, even if data is missing or other failures occur.
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6.1. Transmitting Blocks Using Call-Info
A URI to a block MAY be inserted in any SIP request or response
method (most often INVITE or MESSAGE), using a Call-Info header field
containing a 'purpose' value starting with 'EmergencyCallData', a dot
('.'), and the type of data available at the URI. The type of data
is denoted by including the root of the MIME media subtype (the
'EmergencyCallData' prefix is not repeated), omitting any suffix such
as '+xml'. For example, when referencing a block with MIME media
type 'application/EmergencyCallData.ProviderInfo+xml', the 'purpose'
parameter is set to 'EmergencyCallData.ProviderInfo'. An example
Call-Info header field for this would be:
Call-Info: https://www.example.com/23sedde3;
purpose="EmergencyCallData.ProviderInfo"
A Call-Info header field with a 'purpose' value starting with
'EmergencyCallData' only has meaning in the context of an emergency
call (as ascertained by the presence of an emergency service URN in a
Request-URI header field of a SIP message), test emergency calls
(using an appropriate service URN), and some private-use calls where
the endpoints have a preexisting relationship and privacy concerns do
not apply because of the relationship; use in other contexts is
undefined and is likely to unnecessarily expose confidential data.
If the data is provided by reference, an HTTPS URI MUST be included,
and consequently, Transport Layer Security (TLS) protection is used
during the retrieval of the information.
The data can also be supplied by value in any SIP request or response
method that is permitted to contain a body (i.e., not a BYE request)
[RFC3261]. In this case, CID [RFC2392] is used, with the CID URL
referencing the MIME body part containing the data. Note that
[RFC3261] forbids proxies from altering message bodies, so entities
in the call path that add blocks by value need to do so using an
appropriate SIP entity (e.g., a back-to-back user agent).
Transmitting data by value is especially useful in certain cases,
such as when the data exists in or is generated by the originating
device but is not intended for very large data blocks. Additional
security and privacy considerations apply to data transmitted by
value, as discussed in Sections 9 and 10, respectively.
More than one Call-Info header field with a 'purpose' value starting
with 'EmergencyCallData' can be expected, but at least one MUST be
provided. The device MUST provide one unless it knows that a service
provider is in the path of the call. The device MAY insert one if it
uses a service provider. Each service provider in the path of an
Gellens, et al. Standards Track [Page 36]
RFC 7852 Additional Call Data July 2016
emergency call MUST insert its own. For example, a device, a
telematics service provider in the call path, as well as the mobile
carrier handling the call will each provide one. There might be
circumstances where there is a service provider who is unaware that
the call is an emergency call and cannot reasonably be expected to
determine that it is an emergency call. In that case, that service
provider is not expected to provide EmergencyCallData.
When blocks are transmitted by value, the 'purpose' parameter in a
Call-Info header field identifies the data, and the CID URL points to
the data block in the body (which has a matching Content-ID body part
header field). When a data block is carried in a signed or encrypted
body part, the enclosing multipart (e.g., 'multipart/signed' or
'multipart/encrypted') has the same Content-ID as the data part.
This allows an entity to identify and access the data blocks it is
interested in without having to dive deeply into the message
structure or decrypt parts it is not interested in.
6.2. Transmitting Blocks by Reference Using the <provided-by> Element
The <EmergencyCallDataReference> element is used to transmit an
additional data block by reference within a <provided-by> element of
a PIDF-LO. The <EmergencyCallDataReference> element has two
attributes: 'ref' to specify the URL and 'purpose' to indicate the
type of data block referenced. The value of 'ref' is an HTTPS URL
that resolves to a data structure with information about the call.
The value of 'purpose' is the same as used in a Call-Info header
field (as specified in Section 6.1).
For example, to reference a block with MIME media type 'application/
EmergencyCallData.ProviderInfo+xml', the 'purpose' parameter is set
to 'EmergencyCallData.ProviderInfo'. An example
<EmergencyCallDataReference> element for this would be:
<EmergencyCallDataReference ref="https://www.example.com/23sedde3"
purpose="EmergencyCallData.ProviderInfo"/>
The <EmergencyCallDataReference> element transmits one data block;
multiple data blocks are transmitted by using multiple
<EmergencyCallDataReference> elements. Multiple
<EmergencyCallDataReference> elements MAY be included as child
elements inside the <provided-by> element.
Gellens, et al. Standards Track [Page 37]
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The following is a simplified example:
<provided-by>
<EmergencyCallDataReference
purpose="EmergencyCallData.ServiceInfo"
ref="https://example.com/ref2" />
<EmergencyCallDataReference
purpose="EmergencyCallData.ProviderInfo"
ref="https://example.com/ref3" />
<EmergencyCallDataReference
purpose="EmergencyCallData.Comment"
ref="https://example.com/ref4" />
</provided-by>
Example <provided-by> by Reference
For an example in context, Figure 18 shows a PIDF-LO example with an
<EmergencyCallDataReference> element pointing to an
EmergencyCallData.ServiceInfo data block with the URL in the 'ref'
attribute and the 'purpose' attribute set to
'EmergencyCallData.ServiceInfo'.
6.3. Transmitting Blocks by Value Using the <provided-by> Element
It is RECOMMENDED that access networks supply the data specified in
this document by reference, because PIDF-LOs can be fetched by a
client or other entity and stored locally, so providing the data by
value risks exposing private information to a larger audience.
The <EmergencyCallDataValue> element is used to transmit one or more
additional data blocks by value within a <provided-by> element of a
PIDF-LO. Each block being transmitted is placed (as a child element)
inside the <EmergencyCallDataValue> element. (The same XML structure
as would be contained in the corresponding MIME media type body part
is placed inside the <EmergencyCallDataValue> element.) Multiple
<EmergencyCallDataValue> elements MAY be included as child elements
in the <provided-by> element.
Gellens, et al. Standards Track [Page 38]
RFC 7852 Additional Call Data July 2016
The following is a simplified example:
<provided-by>
<EmergencyCallDataValue>
<EmergencyCallData.ProviderInfo
xmlns=
"urn:ietf:params:xml:ns:EmergencyCallData:ProviderInfo">
<DataProviderReference>flurbit735@es.example.com
</DataProviderReference>
<DataProviderString>Access Network Examples, Inc.
</DataProviderString>
<ProviderID>urn:nena:companyid:Test</ProviderID>
<ProviderIDSeries>NENA</ProviderIDSeries>
<TypeOfProvider>Access Network Provider
</TypeOfProvider>
<ContactURI>tel:+1-555-555-0897</ContactURI>
<Language>en</Language>
</EmergencyCallData.ProviderInfo>
<EmergencyCallData.Comment
xmlns=
"urn:ietf:params:xml:ns:EmergencyCallData:Comment">
<DataProviderReference>flurbit735@es.example.com
</DataProviderReference>
<Comment xml:lang="en">This is an example text.
</Comment>
</EmergencyCallData.Comment>
</EmergencyCallDataValue>
</provided-by>
Example <provided-by> by Value
For an example in context, Figure 18 shows a PIDF-LO example that
contains a <provided-by> element with the
<EmergencyCallData.ProviderInfo> and the <EmergencyCallData.Comment>
elements as child elements of an <EmergencyCallDataValue> element.
6.4. The Content-Disposition Parameter
RFC 5621 [RFC5621] discusses the handling of message bodies in SIP.
It updates and clarifies handling originally defined in RFC 3261
[RFC3261] based on implementation experience. While RFC 3261 did not
mandate support for 'multipart' message bodies, 'multipart/mixed'
MIME bodies are used by many extensions (including this document)
Gellens, et al. Standards Track [Page 39]
RFC 7852 Additional Call Data July 2016
today. For example, adding a PIDF-LO, a Session Description Protocol
(SDP), and additional data in the body of a SIP message requires a
'multipart' message body.
RFC 3204 [RFC3204] and RFC 3459 [RFC3459] define the 'handling'
parameter for the Content-Disposition header field. These RFCs
describe how a User Agent Server (UAS) reacts if it receives a
message body whose content type or disposition type it does not
understand. If the 'handling' parameter has the value 'optional',
the UAS ignores the message body. If the 'handling' parameter has
the value 'required', the UAS returns a 415 (Unsupported Media Type)
response. The 'by-reference' disposition type of RFC 5621 [RFC5621]
allows a SIP message to contain a reference to the body part, and the
SIP User Agent (UA) processes the body part according to the
reference. This is the case for a Call-Info header field containing
a CID URL.
As an example, a SIP message indicates the 'Content-Disposition'
parameter in the body of the SIP message as shown in Figure 14.
Content-Type: application/sdp
...Omit Content-Disposition here; defaults are ok
...SDP goes in here
--boundary1
Content-Type: application/pidf+xml
Content-ID: <target123@atlanta.example.com>
Content-Disposition: by-reference;handling=optional
...PIDF-LO goes in here
--boundary1
Content-Type: application/EmergencyCallData.ProviderInfo+xml
Content-ID: <1234567890@atlanta.example.com>
Content-Disposition: by-reference; handling=optional
...Data provider information data goes in here
--boundary1--
Figure 14: Example for Use of the Content-Disposition Parameter
in SIP
Gellens, et al. Standards Track [Page 40]
RFC 7852 Additional Call Data July 2016
7. Examples
This section illustrates a longer and more complex example, as shown
in Figure 15. In this example, additional data is added by the end
device, included by the VoIP provider, and provided by the access
network provider (via the PIDF-LO).
O +----+ [============] [=============]
/|\ | UA | [ Access ] [ VoIP ]
| +----+ [ Network ] [ Provider ]
/ \ [ Provider ] [ example.org ]
[ ] [ ]
(1) [ ] (2) [ ]
Emergency Call [ ] Emergency Call [ ]
------------------------------------------------------> ]
+Device Info [ ] +Device Info [ ]
+Data Prov. Info [ ^ ] +Data Provider Info [ | ]
+Location URI [=======.====] +Location URI [====|========]
. |
. |
+Location . [==============] |
+Owner/Subscriber Info . [ ] (3) |
+Device Info . (4) [ <------------+
+Data Provider Info #3 ..........> ] Emergency Call
[ ] +Device Info
[ PSAP ] +Data Prov. Info #2
[ ] +Location URI
[==============]
Legend:
--- Emergency Call Setup Procedure
... Location Retrieval/Response
Figure 15: Additional Data Example Flow
Gellens, et al. Standards Track [Page 41]
RFC 7852 Additional Call Data July 2016
The example scenario starts with the end device itself adding device
information, owner/subscriber information, a location URI, and data
provider information to the outgoing emergency call setup message
(see step #1 in Figure 15). The SIP INVITE example is shown in
Figure 16.
INVITE urn:service:sos SIP/2.0
Via: SIPS/2.0/TLS server.example.com;branch=z9hG4bK74bf9
Max-Forwards: 70
To: <urn:service:sos>
From: Hannes Tschofenig <sips:hannes@example.com>;tag=9fxced76sl
Call-ID: 3848276298220188511@example.com
Call-Info: <http://wwww.example.com/hannes/photo.jpg>
;purpose=icon,
<http://www.example.com/hannes/> ;purpose=info,
<cid:1234567890@atlanta.example.com>
;purpose=EmergencyCallData.ProviderInfo,
<cid:0123456789@atlanta.example.com>
;purpose=EmergencyCallData.DeviceInfo
Geolocation: <https://ls.example.net:9768/357yc6s64ceyoiuy5ax3o>
Geolocation-Routing: yes
Accept: application/sdp, application/pidf+xml,
application/EmergencyCallData.ProviderInfo+xml
CSeq: 31862 INVITE
Contact: <sips:hannes@example.com>
Content-Type: multipart/mixed; boundary=boundary1
Content-Length: ...
--boundary1
Content-Type: application/sdp
...SDP goes here
--boundary1
Content-Type: application/EmergencyCallData.DeviceInfo+xml
Content-ID: <0123456789@atlanta.example.com>
Content-Disposition: by-reference;handling=optional
<?xml version="1.0" encoding="UTF-8"?>
<dev:EmergencyCallData.DeviceInfo
xmlns:dev=
"urn:ietf:params:xml:ns:EmergencyCallData:DeviceInfo">
<dev:DataProviderReference>
d4b3072df09876543@[93.184.216.119]
</dev:DataProviderReference>
<dev:DeviceClassification>laptop</dev:DeviceClassification>
<dev:UniqueDeviceID
TypeOfDeviceID="MAC">00-0d-4b-30-72-df
Gellens, et al. Standards Track [Page 42]
RFC 7852 Additional Call Data July 2016
</dev:UniqueDeviceID>
</dev:EmergencyCallData.DeviceInfo>
--boundary1
Content-Type: application/EmergencyCallData.ProviderInfo+xml
Content-ID: <1234567890@atlanta.example.com>
Content-Disposition: by-reference;handling=optional
<?xml version="1.0" encoding="UTF-8"?>
<pi:EmergencyCallData.ProviderInfo
xmlns:pi=
"urn:ietf:params:xml:ns:EmergencyCallData:ProviderInfo">
<pi:DataProviderReference>d4b3072df09876543@[93.184.216.119]
</pi:DataProviderReference>
<pi:DataProviderString>Hannes Tschofenig</pi:DataProviderString>
<pi:TypeOfProvider>Client</pi:TypeOfProvider>
<pi:ContactURI>tel:+1-555-555-0123</pi:ContactURI>
<pi:Language>en</pi:Language>
<pi:DataProviderContact
xmlns="urn:ietf:params:xml:ns:vcard-4.0">
<vcard>
<fn><text>Hannes Tschofenig</text></fn>
<n>
<surname>Hannes</surname>
<given>Tschofenig</given>
<additional/>
<prefix/>
<suffix>Dipl. Ing.</suffix>
</n>
<bday><date>--0203</date></bday>
<anniversary>
<date-time>20090808T1430-0500</date-time>
</anniversary>
<gender><sex>M</sex></gender>
<lang>
<parameters><pref><integer>1</integer></pref>
</parameters>
<language-tag>de</language-tag>
</lang>
<lang>
<parameters><pref><integer>2</integer></pref>
</parameters>
<language-tag>en</language-tag>
</lang>
<adr>
<parameters>
<type><text>work</text></type>
<label><text>Hannes Tschofenig
Gellens, et al. Standards Track [Page 43]
RFC 7852 Additional Call Data July 2016
Linnoitustie 6
Espoo, Finland
02600</text></label>
</parameters>
<pobox/>
<ext/>
<street>Linnoitustie 6</street>
<locality>Espoo</locality>
<region>Uusimaa</region>
<code>02600</code>
<country>Finland</country>
</adr>
<adr>
<parameters>
<type><text>home</text></type>
<label><text>Hannes Tschofenig
c/o Hotel DuPont
42 W 11th St
Wilmington, DE 19801
USA</text></label>
</parameters>
<pobox/>
<ext/>
<street>42 W 11th St</street>
<locality>Wilmington</locality>
<region>DE</region>
<code>19801</code>
<country>USA</country>
</adr>
<tel>
<parameters>
<type>
<text>work</text>
<text>voice</text>
</type>
</parameters>
<uri>tel:+358 50 4871445</uri>
</tel>
<tel>
<parameters>
<type>
<text>home</text>
<text>voice</text>
</type>
</parameters>
<uri>tel:+1-555-555-0123</uri>
</tel>
<tel>
Gellens, et al. Standards Track [Page 44]
RFC 7852 Additional Call Data July 2016
<parameters>
<type>
<text>work</text>
<text>voice</text>
<text>main-number</text>
</type>
</parameters>
<uri>tel:+1-302-594-3100</uri>
</tel>
<email>
<parameters><type><text>work</text></type>
</parameters>
<text>hannes.tschofenig@nsn.com</text>
</email>
<geo>
<parameters><type><text>work</text></type>
</parameters>
<uri>geo:60.210796,24.812924</uri>
</geo>
<geo>
<parameters><type><text>home</text></type>
</parameters>
<uri>geo:39.746537,-75.548027</uri>
</geo>
<key>
<parameters>
<type><text>home</text></type>
</parameters>
<uri>https://www.example.com/key.asc</uri>
</key>
<tz><text>Finland/Helsinki</text></tz>
<url>
<parameters><type><text>home</text></type>
</parameters>
<uri>http://example.com/hannes.tschofenig
</uri>
</url>
</vcard>
</pi:DataProviderContact>
</pi:EmergencyCallData.ProviderInfo>
--boundary1--
Figure 16: End Device Sending SIP INVITE with Additional Data
In this example, information available to the access network provider
is included in the call setup message only indirectly via the use of
the location reference. The PSAP has to retrieve it via a separate
lookup step. Since the access network provider and the VoIP service
Gellens, et al. Standards Track [Page 45]
RFC 7852 Additional Call Data July 2016
provider are two independent entities in this scenario, the access
network provider is not involved in application-layer exchanges; the
SIP INVITE transits the access network transparently, as illustrated
in steps #1 and #2 (the access network does not alter the SIP
INVITE).
The VoIP service provider receives the message and determines, based
on the service URN, that the incoming request is an emergency call.
It performs typical emergency-services-related tasks (such as
location-based routing) and adds additional data, namely service and
subscriber information as well as data provider information #2, to
the outgoing message. For the example, we assume a VoIP service
provider deploys a back-to-back user agent allowing additional data
to be included in the body of the SIP message (rather than by
reference), which allows us to illustrate the use of multiple data
provider info blocks. The resulting message is shown in Figure 17.
The SIP INVITE is sent to the PSAP in step #3.
INVITE sips:psap@example.org SIP/2.0
Via: SIPS/2.0/TLS server.example.com;branch=z9hG4bK74bf9
Max-Forwards: 70
To: <urn:service:sos>
From: Hannes Tschofenig <sips:hannes@example.com>;tag=9fxced76sl
Call-ID: 3848276298220188511@example.com
Call-Info: <http://wwww.example.com/hannes/photo.jpg>;
purpose=icon,
<http://www.example.com/hannes/>; purpose=info,
<cid:1234567890@atlanta.example.com>;
purpose=EmergencyCallData.ProviderInfo
<cid:0123456789@atlanta.example.com>;
purpose=EmergencyCallData.DeviceInfo
Call-Info: <cid:bloorpyhex@atlanta.example.com>;
purpose=EmergencyCallData.ServiceInfo
Call-Info: <cid:aaabbb@atlanta.example.com>;
purpose=EmergencyCallData.ProviderInfo
Geolocation: <https://ls.example.net:9768/357yc6s64ceyoiuy5ax3o>
Geolocation-Routing: yes
Accept: application/sdp, application/pidf+xml,
application/EmergencyCallData.ProviderInfo+xml
CSeq: 31862 INVITE
Contact: <sips:hannes@example.com>
Content-Type: multipart/mixed; boundary=boundary1
Content-Length: ...
--boundary1
Content-Type: application/sdp
...SDP goes here
Gellens, et al. Standards Track [Page 46]
RFC 7852 Additional Call Data July 2016
--boundary1
Content-Type: application/EmergencyCallData.DeviceInfo+xml
Content-ID: <0123456789@atlanta.example.com>
Content-Disposition: by-reference;handling=optional
<?xml version="1.0" encoding="UTF-8"?>
<dev:EmergencyCallData.DeviceInfo
xmlns:dev=
"urn:ietf:params:xml:ns:EmergencyCallData:DeviceInfo">
<dev:DataProviderReference>d4b3072df09876543@[93.184.216.119]
</dev:DataProviderReference>
<dev:DeviceClassification>laptop</dev:DeviceClassification>
<dev:UniqueDeviceID
TypeOfDeviceID="MAC">00-0d-4b-30-72-df</dev:UniqueDeviceID>
</dev:EmergencyCallData.DeviceInfo>
--boundary1
Content-Type: application/EmergencyCallData.ProviderInfo+xml
Content-ID: <1234567890@atlanta.example.com>
Content-Disposition: by-reference;handling=optional
<?xml version="1.0" encoding="UTF-8"?>
<pi:EmergencyCallData.ProviderInfo
xmlns:pi=
"urn:ietf:params:xml:ns:EmergencyCallData:ProviderInfo">
<pi:DataProviderReference>d4b3072df09876543@[93.184.216.119]
</pi:DataProviderReference>
<pi:DataProviderString>Hannes Tschofenig
</pi:DataProviderString>
<pi:TypeOfProvider>Client</pi:TypeOfProvider>
<pi:ContactURI>tel:+1-555-555-0123</pi:ContactURI>
<pi:Language>en</pi:Language>
<pi:DataProviderContact
xmlns="urn:ietf:params:xml:ns:vcard-4.0">
<vcard>
<fn><text>Hannes Tschofenig</text></fn>
<n>
<surname>Hannes</surname>
<given>Tschofenig</given>
<additional/>
<prefix/>
<suffix>Dipl. Ing.</suffix>
</n>
<bday><date>--0203</date></bday>
<anniversary>
<date-time>20090808T1430-0500</date-time>
</anniversary>
<gender><sex>M</sex></gender>
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<lang>
<parameters><pref><integer>1</integer></pref>
</parameters>
<language-tag>de</language-tag>
</lang>
<lang>
<parameters><pref><integer>2</integer></pref>
</parameters>
<language-tag>en</language-tag>
</lang>
<adr>
<parameters>
<type><text>work</text></type>
<label><text>Hannes Tschofenig
Linnoitustie 6
Espoo, Finland
02600</text></label>
</parameters>
<pobox/>
<ext/>
<street>Linnoitustie 6</street>
<locality>Espoo</locality>
<region>Uusimaa</region>
<code>02600</code>
<country>Finland</country>
</adr>
<adr>
<parameters>
<type><text>home</text></type>
<label><text>Hannes Tschofenig
c/o Hotel DuPont
42 W 11th St
Wilmington, DE 19801
USA</text></label>
</parameters>
<pobox/>
<ext/>
<street>42 W 11th St</street>
<locality>Wilmington</locality>
<region>DE</region>
<code>19801</code>
<country>USA</country>
</adr>
<tel>
<parameters>
<type>
<text>work</text>
<text>voice</text>
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</type>
</parameters>
<uri>tel:+358 50 4871445</uri>
</tel>
<tel>
<parameters>
<type>
<text>home</text>
<text>voice</text>
</type>
</parameters>
<uri>tel:+1-555-555-0123</uri>
</tel>
<email>
<parameters><type><text>work</text></type>
</parameters>
<text>hannes.tschofenig@nsn.com</text>
</email>
<geo>
<parameters><type><text>work</text></type>
</parameters>
<uri>geo:60.210796,24.812924</uri>
</geo>
<geo>
<parameters><type><text>home</text></type>
</parameters>
<uri>geo:39.746537,-75.548027</uri>
</geo>
<key>
<parameters>
<type><text>home</text></type>
</parameters>
<uri>https://www.example.com/key.asc</uri>
</key>
<tz><text>Finland/Helsinki</text></tz>
<url>
<parameters><type><text>home</text></type>
</parameters>
<uri>http://example.com/hannes.tschofenig</uri>
</url>
</vcard>
</pi:DataProviderContact>
</pi:EmergencyCallData.ProviderInfo>
--boundary1
Content-Type: application/EmergencyCallData.ServiceInfo+xml
Content-ID: <bloorpyhex@atlanta.example.com>
Content-Disposition: by-reference;handling=optional
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RFC 7852 Additional Call Data July 2016
<?xml version="1.0" encoding="UTF-8"?>
<svc:EmergencyCallData.ServiceInfo
xmlns:svc=
"urn:ietf:params:xml:ns:EmergencyCallData:ServiceInfo">
<svc:DataProviderReference>string0987654321@example.org
</svc:DataProviderReference>
<svc:ServiceEnvironment>Residence</svc:ServiceEnvironment>
<svc:ServiceType>VOIP</svc:ServiceType>
<svc:ServiceMobility>Unknown</svc:ServiceMobility>
</svc:EmergencyCallData.ServiceInfo>
--boundary1
Content-Type: application/EmergencyCallData.ProviderInfo+xml
Content-ID: <aaabbb@atlanta.example.com>
Content-Disposition: by-reference;handling=optional
<?xml version="1.0" encoding="UTF-8"?>
<pi:EmergencyCallData.ProviderInfo
xmlns:pi=
"urn:ietf:params:xml:ns:EmergencyCallData:ProviderInfo">
<pi:DataProviderReference>string0987654321@example.org
</pi:DataProviderReference>
<pi:DataProviderString>Exemplar VoIP Provider
</pi:DataProviderString>
<pi:ProviderID>urn:nena:companyid:ID123</pi:ProviderID>
<pi:ProviderIDSeries>NENA</pi:ProviderIDSeries>
<pi:TypeOfProvider>Service Provider</pi:TypeOfProvider>
<pi:ContactURI>sip:voip-provider@example.com</pi:ContactURI>
<pi:Language>en</pi:Language>
<pi:DataProviderContact
xmlns="urn:ietf:params:xml:ns:vcard-4.0">
<vcard>
<fn><text>John Doe</text></fn>
<n>
<surname>John</surname>
<given>Doe</given>
<additional/>
<prefix/>
<suffix/>
</n>
<bday><date>--0203</date></bday>
<anniversary>
<date-time>20090808T1430-0500</date-time>
</anniversary>
<gender><sex>M</sex></gender>
<lang>
<parameters><pref><integer>1</integer></pref>
</parameters>
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<language-tag>en</language-tag>
</lang>
<org>
<parameters><type><text>work</text></type>
</parameters>
<text>Exemplar VoIP Provider</text>
</org>
<adr>
<parameters>
<type><text>work</text></type>
<label><text>John Doe
123 Middle Street
The Sticks, IA 50055</text></label>
</parameters>
<pobox/>
<ext/>
<street>123 Middle Street</street>
<locality>The Sticks</locality>
<region>IA</region>
<code>50055</code>
<country>USA</country>
</adr>
<tel>
<parameters>
<type>
<text>work</text>
<text>voice</text>
<text>main-number</text>
</type>
</parameters>
<uri>sips:john.doe@example.com</uri>
</tel>
<email>
<parameters><type><text>work</text></type>
</parameters>
<text>john.doe@example.com</text>
</email>
<geo>
<parameters><type><text>work</text></type>
</parameters>
<uri>geo:41.761838,-92.963268</uri>
</geo>
<tz><text>America/Chicago</text></tz>
<url>
<parameters><type><text>home</text></type>
</parameters>
<uri>http://www.example.com/john.doe</uri>
</url>
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</vcard>
</pi:DataProviderContact>
</pi:EmergencyCallData.ProviderInfo>
--boundary1--
Figure 17: VoIP Provider Sending SIP INVITE with Additional Data
Finally, the PSAP requests location information from the access
network provider. The response is shown in Figure 18. Along with
the location information, additional data is provided in the
<provided-by> element of the PIDF-LO. This request and response is
step #4.
<?xml version="1.0" encoding="UTF-8"?>
<presence xmlns="urn:ietf:params:xml:ns:pidf"
xmlns:gp="urn:ietf:params:xml:ns:pidf:geopriv10"
xmlns:gbp="urn:ietf:params:xml:ns:pidf:geopriv10:basicPolicy"
xmlns:dm="urn:ietf:params:xml:ns:pidf:data-model"
entity="pres:alice@atlanta.example.com">
<dm:device id="target123-1">
<gp:geopriv>
<gp:location-info>
<civicAddress
xmlns="urn:ietf:params:xml:ns:pidf:geopriv10:civicAddr">
<country>US</country>
<A1>DE</A1>
<A3>Wilmington</A3>
<PRD>W</PRD>
<RD>11th</RD>
<STS>Street</STS>
<HNO>42</HNO>
<NAM>The Hotel DuPont</NAM>
<PC>19801</PC>
</civicAddress>
</gp:location-info>
<gp:usage-rules>
<gbp:retransmission-allowed>true
</gbp:retransmission-allowed>
<gbp:retention-expiry>2013-12-10T20:00:00Z
</gbp:retention-expiry>
</gp:usage-rules>
<gp:method>802.11</gp:method>
<gp:provided-by
xmlns="urn:ietf:params:xml:ns:EmergencyCallData">
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RFC 7852 Additional Call Data July 2016
<EmergencyCallDataReference
purpose="EmergencyCallData.ServiceInfo"
ref="https://example.com/ref2" />
<EmergencyCallDataValue>
<EmergencyCallData.ProviderInfo
xmlns=
"urn:ietf:params:xml:ns:EmergencyCallData:ProviderInfo">
<DataProviderReference>88QV4FpfZ976T@example.com
</DataProviderReference>
<DataProviderString>Diamond State Exemplar
</DataProviderString>
<ProviderID>urn:nena:companyid:diamond</ProviderID>
<ProviderIDSeries>NENA</ProviderIDSeries>
<TypeOfProvider>Access Network Provider</TypeOfProvider>
<ContactURI>tel:+1-302-555-0000</ContactURI>
<Language>en</Language>
</EmergencyCallData.ProviderInfo>
<EmergencyCallData.Comment
xmlns="urn:ietf:params:xml:ns:EmergencyCallData:Comment">
<DataProviderReference>88QV4FpfZ976T@example.com
</DataProviderReference>
<Comment xml:lang="en">This is an example text.</Comment>
</EmergencyCallData.Comment>
</EmergencyCallDataValue>
</gp:provided-by>
</gp:geopriv>
<dm:deviceID>mac:00-0d-4b-30-72-df</dm:deviceID>
<dm:timestamp>2013-07-09T20:57:29Z</dm:timestamp>
</dm:device>
</presence>
Figure 18: Access Network Provider Returning PIDF-LO
with Additional Data
8. XML Schemas
This section defines the XML schemas of the five data blocks.
Additionally, the provided-by schema is specified.
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8.1. EmergencyCallData.ProviderInfo XML Schema
<?xml version="1.0"?>
<xs:schema
targetNamespace=
"urn:ietf:params:xml:ns:EmergencyCallData:ProviderInfo"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:pi="urn:ietf:params:xml:ns:EmergencyCallData:ProviderInfo"
xmlns:xml="http://www.w3.org/XML/1998/namespace"
xmlns:xc="urn:ietf:params:xml:ns:vcard-4.0"
elementFormDefault="qualified"
attributeFormDefault="unqualified">
<xs:import namespace="http://www.w3.org/XML/1998/namespace"
schemaLocation="http://www.w3.org/2009/01/xml.xsd"/>
<xs:import namespace="urn:ietf:params:xml:ns:vcard-4.0"
schemaLocation="vcard.xsd"/>
<xs:element
name="EmergencyCallData.ProviderInfo"
type="pi:ProviderInfoType"/>
<xs:simpleType name="SubcontractorPriorityType">
<xs:restriction base="xs:string">
<xs:enumeration value="sub"/>
<xs:enumeration value="main"/>
</xs:restriction>
</xs:simpleType>
<xs:complexType name="ProviderInfoType">
<xs:sequence>
<xs:element name="DataProviderReference"
type="xs:token" minOccurs="1" maxOccurs="1"/>
<xs:element name="DataProviderString"
type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="ProviderID"
type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="ProviderIDSeries"
type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="TypeOfProvider"
type="xs:token" minOccurs="1" maxOccurs="1"/>
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<xs:element name="ContactURI" type="xs:anyURI"
minOccurs="1" maxOccurs="1"/>
<xs:element name="Language" minOccurs="1" maxOccurs="unbounded">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:pattern
value="([a-z]{2,3}((-[a-z]{3}){0,3})?|[a-z]{4,8})
(-[a-z]{4})?(-([a-z]{2}|\d{3}))?(-([0-9a-z]{5,8}|
\d[0-9a-z]{3}))*(-[0-9a-wyz](-[0-9a-z]{2,8})+)*
(-x(-[0-9a-z]{1,8})+)?|x(-[0-9a-z]{1,8})+|[a-z]{1,3}
(-[0-9a-z]{2,8}){1,2}"/>
</xs:restriction>
</xs:simpleType>
</xs:element>
<xs:element name="DataProviderContact"
minOccurs="0" maxOccurs="1">
<xs:complexType>
<xs:sequence>
<xs:element minOccurs="0"
maxOccurs="unbounded" ref="xc:vcard"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="SubcontractorPrincipal"
type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="SubcontractorPriority"
type="pi:SubcontractorPriorityType"
minOccurs="0" maxOccurs="1"/>
<xs:any namespace="##other" processContents="lax"
minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
</xs:schema>
Figure 19: EmergencyCallData.ProviderInfo XML Schema
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8.2. EmergencyCallData.ServiceInfo XML Schema
<?xml version="1.0"?>
<xs:schema
targetNamespace=
"urn:ietf:params:xml:ns:EmergencyCallData:ServiceInfo"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:svc="urn:ietf:params:xml:ns:EmergencyCallData:ServiceInfo"
xmlns:xml="http://www.w3.org/XML/1998/namespace"
elementFormDefault="qualified"
attributeFormDefault="unqualified">
<xs:import namespace="http://www.w3.org/XML/1998/namespace"
schemaLocation="http://www.w3.org/2001/xml.xsd"/>
<xs:element name="EmergencyCallData.ServiceInfo"
type="svc:ServiceInfoType"/>
<xs:complexType name="ServiceInfoType">
<xs:sequence>
<xs:element name="DataProviderReference"
type="xs:token" minOccurs="1" maxOccurs="1"/>
<xs:element name="ServiceEnvironment"
type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="ServiceType"
type="xs:string" minOccurs="1"
maxOccurs="unbounded"/>
<xs:element name="ServiceMobility"
type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:any namespace="##other" processContents="lax"
minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
</xs:schema>
Figure 20: EmergencyCallData.ServiceInfo XML Schema
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8.3. EmergencyCallData.DeviceInfo XML Schema
<?xml version="1.0"?>
<xs:schema
targetNamespace=
"urn:ietf:params:xml:ns:EmergencyCallData:DeviceInfo"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:dev="urn:ietf:params:xml:ns:EmergencyCallData:DeviceInfo"
xmlns:xml="http://www.w3.org/XML/1998/namespace"
elementFormDefault="qualified"
attributeFormDefault="unqualified">
<xs:import namespace="http://www.w3.org/XML/1998/namespace"
schemaLocation="http://www.w3.org/2001/xml.xsd"/>
<xs:element name="EmergencyCallData.DeviceInfo"
type="dev:DeviceInfoType"/>
<xs:complexType name="DeviceInfoType">
<xs:sequence>
<xs:element name="DataProviderReference"
type="xs:token" minOccurs="1" maxOccurs="1"/>
<xs:element name="DeviceClassification"
type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="DeviceMfgr"
type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="DeviceModelNr"
type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:element name="UniqueDeviceID" minOccurs="0"
maxOccurs="unbounded">
<xs:complexType>
<xs:simpleContent>
<xs:extension base="xs:string">
<xs:attribute name="TypeOfDeviceID"
type="xs:string"
use="required"/>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
</xs:element>
<xs:element name="DeviceSpecificData"
type="xs:anyURI" minOccurs="0" maxOccurs="1"/>
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RFC 7852 Additional Call Data July 2016
<xs:element name="DeviceSpecificType"
type="xs:string" minOccurs="0" maxOccurs="1"/>
<xs:any namespace="##other" processContents="lax"
minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
</xs:schema>
Figure 21: EmergencyCallData.DeviceInfo XML Schema
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8.4. EmergencyCallData.SubscriberInfo XML Schema
<?xml version="1.0"?>
<xs:schema
targetNamespace=
"urn:ietf:params:xml:ns:EmergencyCallData:SubscriberInfo"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:sub=
"urn:ietf:params:xml:ns:EmergencyCallData:SubscriberInfo"
xmlns:xc="urn:ietf:params:xml:ns:vcard-4.0"
xmlns:xml="http://www.w3.org/XML/1998/namespace"
elementFormDefault="qualified"
attributeFormDefault="unqualified">
<xs:import namespace="http://www.w3.org/XML/1998/namespace"
schemaLocation="http://www.w3.org/2001/xml.xsd"/>
<xs:import namespace="urn:ietf:params:xml:ns:vcard-4.0"
schemaLocation="vcard.xsd"/>
<xs:element name="EmergencyCallData.SubscriberInfo"
type="sub:SubscriberInfoType"/>
<xs:complexType name="SubscriberInfoType">
<xs:sequence>
<xs:element name="DataProviderReference" type="xs:token"
minOccurs="1" maxOccurs="1"/>
<xs:element name="SubscriberData">
<xs:complexType>
<xs:sequence>
<xs:element ref="xc:vcard"
maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:any namespace="##other" processContents="lax"
minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
<xs:attribute name="privacyRequested"
type="xs:boolean" use="required"/>
</xs:complexType>
</xs:schema>
Figure 22: EmergencyCallData.SubscriberInfo XML Schema
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8.5. EmergencyCallData.Comment XML Schema
<?xml version="1.0"?>
<xs:schema
targetNamespace=
"urn:ietf:params:xml:ns:EmergencyCallData:Comment"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:com="urn:ietf:params:xml:ns:EmergencyCallData:Comment"
xmlns:xml="http://www.w3.org/XML/1998/namespace"
elementFormDefault="qualified"
attributeFormDefault="unqualified">
<xs:import namespace="http://www.w3.org/XML/1998/namespace"
schemaLocation="http://www.w3.org/2001/xml.xsd"/>
<xs:element name="EmergencyCallData.Comment"
type="com:CommentType"/>
<xs:complexType name="CommentType">
<xs:sequence>
<xs:element name="DataProviderReference"
type="xs:token" minOccurs="1" maxOccurs="1"/>
<xs:element name="Comment"
type="com:CommentSubType" minOccurs="0"
maxOccurs="unbounded"/>
<xs:any namespace="##other" processContents="lax"
minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="CommentSubType">
<xs:simpleContent>
<xs:extension base="xs:string">
<xs:attribute ref="xml:lang"/>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
</xs:schema>
Figure 23: EmergencyCallData.Comment XML Schema
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8.6. provided-by XML Schema
This section defines the provided-by schema.
<?xml version="1.0"?>
<xs:schema
targetNamespace="urn:ietf:params:xml:ns:EmergencyCallData"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:ad="urn:ietf:params:xml:ns:EmergencyCallData"
xmlns:xml="http://www.w3.org/XML/1998/namespace"
xmlns:pi="urn:ietf:params:xml:ns:EmergencyCallData:ProviderInfo"
xmlns:svc="urn:ietf:params:xml:ns:EmergencyCallData:ServiceInfo"
xmlns:dev="urn:ietf:params:xml:ns:EmergencyCallData:DeviceInfo"
xmlns:sub="urn:ietf:params:xml:ns:EmergencyCallData:SubscriberInfo"
xmlns:com="urn:ietf:params:xml:ns:EmergencyCallData:Comment"
elementFormDefault="qualified"
attributeFormDefault="unqualified">
<xs:import
namespace="urn:ietf:params:xml:ns:EmergencyCallData:ProviderInfo"
schemaLocation="ProviderInfo.xsd"/>
<xs:import
namespace="urn:ietf:params:xml:ns:EmergencyCallData:ServiceInfo"
schemaLocation="ServiceInfo.xsd"/>
<xs:import
namespace="urn:ietf:params:xml:ns:EmergencyCallData:DeviceInfo"
schemaLocation="DeviceInfo.xsd"/>
<xs:import
namespace="urn:ietf:params:xml:ns:EmergencyCallData:SubscriberInfo"
schemaLocation="SubscriberInfo.xsd"/>
<xs:import
namespace="urn:ietf:params:xml:ns:EmergencyCallData:Comment"
schemaLocation="Comment.xsd"/>
<xs:element name="EmergencyCallDataReference" type="ad:ByRefType"/>
<xs:element name="EmergencyCallDataValue"
type="ad:EmergencyCallDataValueType"/>
<!-- Additional Data By Reference -->
<xs:complexType name="ByRefType">
<xs:sequence>
<xs:any namespace="##other" processContents="lax"
minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
<xs:attribute name="purpose" type="xs:token" use="required"/>
<xs:attribute name="ref" type="xs:anyURI" use="required"/>
</xs:complexType>
<!-- Additional Data By Value -->
<xs:complexType name="EmergencyCallDataValueType">
<xs:sequence>
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<xs:element ref="pi:EmergencyCallData.ProviderInfo"
minOccurs="0" maxOccurs="unbounded"/>
<xs:element ref="svc:EmergencyCallData.ServiceInfo"
minOccurs="0" maxOccurs="unbounded"/>
<xs:element ref="dev:EmergencyCallData.DeviceInfo"
minOccurs="0" maxOccurs="unbounded"/>
<xs:element ref="sub:EmergencyCallData.SubscriberInfo"
minOccurs="0" maxOccurs="unbounded"/>
<xs:element ref="com:EmergencyCallData.Comment"
minOccurs="0" maxOccurs="unbounded"/>
<xs:any namespace="##other" processContents="lax"
minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
</xs:schema>
Figure 24: provided-by XML Schema
9. Security Considerations
The data structures described in this document contain information
usually considered private. When information is provided by value,
entities that are a party to the SIP signaling (such as proxy servers
and back-to-back user agents) will have access to it and need to
protect it against inappropriate disclosure. An entity that is able
to eavesdrop on the SIP signaling will also have access. Some
Internet access types (such as in-the-clear Wi-Fi) are more
vulnerable than others (such as 3G or 4G cellular data traffic) to
eavesdropping. Mechanisms that protect against eavesdropping (such
as TLS version 1.2 or later) SHOULD be preferentially used whenever
feasible. (This requirement is not a "MUST" because there is an
existing deployed base of clear-text SIP, and also because, as an
emergency call, it is more important for the call to go through than
for it to be protected; for example, the call MUST proceed even if
the TLS negotiation or certificate verification fails for whatever
reason.) When information is provided by reference, TLS mutual
authentication is REQUIRED. That is, HTTPS is REQUIRED for
dereferencing, the requester MUST use a client certificate to
authenticate the HTTP request, and the provider of the information is
REQUIRED to validate the credentials provided by the requester.
While the creation of a public key infrastructure (PKI) that has
global scope might be difficult, the alternatives to creating devices
and services that can provide critical information securely are more
daunting. The provider of the information MAY enforce any policy it
wishes to use, but PSAPs and responder agencies are strongly advised
to deploy a PKI so that providers of additional data can check the
certificate of the client (the requester) and decide the appropriate
policy to enforce based on that certificate.
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TLS MUST be version 1.2 or later. It is RECOMMENDED to use only
cipher suites that offer Perfect Forward Secrecy (PFS) and avoid
Cipher Block Chaining (CBC) and to follow the recommendations in BCP
195 [RFC7525].
Ideally, the PSAP and emergency responders will be given credentials
signed by an authority trusted by the data provider. In most
circumstances, nationally recognized credentials are sufficient; the
emergency services community within a country can arrange a PKI, data
providers can be provisioned with the root Certification Authority
(CA) public key for the country. Some nations are developing a PKI
for this and related purposes. Since calls could be made from
devices where the device and/or the service provider(s) is not local
to the emergency services authorities, globally recognized
credentials are useful. This might be accomplished by extending the
notion of the "forest guide" described in [RFC5582] to allow the
forest guide to provide the credential of the PKI root for areas for
which it has coverage information, but standards for such a mechanism
are not yet available. In its absence, the data provider needs to
obtain by out-of-band means the root CA credentials for any areas to
which it is willing to provide additional data. With the credential
of the root CA for a national emergency services PKI, the data
provider server can validate the credentials of an entity requesting
additional data by reference.
The data provider also needs a credential that can be verified by the
emergency services to know that it is receiving data from an
authorized server. The emergency services authorities could provide
credentials, distinguishable from credentials provided to emergency
responders and PSAPs, which could be used to validate data providers.
Such credentials would have to be acceptable to any PSAP or responder
that could receive a call with additional data supplied by that
provider. This would be extensible to global credential validation
using the forest guide as mentioned above. In the absence of such
credentials, the emergency services authorities could maintain a list
of local data providers' credentials as provided to them out of band.
At a minimum, the emergency services authorities could obtain a
credential from the DNS entry of the domain in the additional data
URI (e.g., using DNS-Based Authentication of Named Entities (DANE)
[RFC6698]) to at least validate that the server is known to the
domain providing the URI.
When devices provide data by reference, the credential validation
issues are similar to when service providers do so, and while the
solutions are the same, the challenges of doing so for every device
are obviously more difficult, especially when considering root
certificate updates, revocation lists, etc. However, in general,
devices are not expected to provide data directly by reference, but
Gellens, et al. Standards Track [Page 63]
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rather to either provide data by value or upload the data to a server
that can more reliably make it available and more easily enforce
security policy. Devices that do provide data directly by reference,
which might include fixed-location sensors, will need to be capable
of handling this.
Neither service providers nor devices will supply private information
unless the call is recognized as an emergency call. In cellular
telephony systems (such as those using 3GPP IMS), there are different
procedures for an originating device to place an emergency call
versus a normal call. If a call that is really an emergency call is
initiated as a normal call and the cellular service provider
recognizes this, 3GPP IMS permits the service provider to either
accept the call anyway or reject it with a specific code that
instructs the device to retry the call as an emergency call. Service
providers ought to choose the latter, otherwise the device will not
include the information specified in this document (since the device
didn't recognize the call as being an emergency call).
10. Privacy Considerations
This document enables functionality for conveying additional
information about the caller and the caller's device and service to
the callee. Some of this information is personal data and therefore
privacy concerns arise. An explicit privacy indicator for
information directly relating to the caller's identity is defined and
use is mandatory. However, observance of this request for privacy
and which information it relates to is determined by the destination
jurisdiction (which replicates functionality provided in some legacy
emergency services systems).
There are a number of privacy concerns with non-emergency real-time
communication services that are also applicable to emergency calling.
Data protection regulation worldwide has, however, decided to create
exceptions for emergency services since the drawbacks of disclosing
personal data are outweighed by the benefit for the emergency caller.
Hence, the data protection rights of individuals are commonly waived
for emergency situations. There are, however, still various
countries that offer some degree of anonymity for the caller towards
PSAP call takers.
The functionality defined in this document far exceeds the amount of
information sharing available in the legacy POTS system. For this
reason, there are additional privacy threats to consider, which are
described in more detail in [RFC6973].
Gellens, et al. Standards Track [Page 64]
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Stored Data Compromise: There is an increased risk of stored data
compromise since additional data is collected and stored in
databases. Without adequate measures to secure stored data from
unauthorized or inappropriate access at access network providers,
service providers, end devices, as well as PSAPs, individuals are
exposed to potential financial, reputational, or physical harm.
Misattribution: If the personal data collected and conveyed is
incorrect or inaccurate, then this can lead to misattribution.
Misattribution occurs when data or communications related to one
individual are attributed to another.
Identification: By the nature of the additional data and its
capability to provide much richer information about the caller,
the call, and the location, the calling party is identified in a
much better way. Some users could feel uncomfortable with this
degree of information sharing even in emergency services
situations.
Secondary Use: There is a risk of secondary use, which is the use of
collected information about an individual without the individual's
consent for a purpose different from that for which the
information was collected. The stated purpose of the additional
data is for emergency services purposes, but theoretically the
same information could be used for any other call as well.
Additionally, parties involved in the emergency call could retain
the obtained information and reuse it for other, non-emergency
services purposes. While technical measures are not in place to
prevent such secondary reuse, policy, legal, regulatory, and other
non-technical approaches can be effective.
Disclosure: When the data defined in this document is not properly
protected (while in transit with traditional communication
security techniques and while stored using access control
mechanisms), there is the risk of disclosure, which is the
revelation of private information about an individual.
To mitigate these privacy risks, the following countermeasures can be
taken:
In regions where callers can elect to suppress certain personally
identifying information, network or PSAP functionality can inspect
privacy flags within the SIP headers to determine what information
can be passed, stored, or displayed to comply with local policy or
law. RFC 3325 [RFC3325] defines the 'id' priv-value token. The
presence of this privacy type in a Privacy header field indicates
Gellens, et al. Standards Track [Page 65]
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that the user would like the network asserted identity to be kept
private with respect to SIP entities outside the trust domain with
which the user authenticated, including the PSAP.
This document defines various data structures that contain privacy-
sensitive data such as, for example, identifiers for the device
(e.g., serial number and MAC address) or account/SIM (e.g., IMSI),
contact information for the user, and location of the caller. Local
regulations may govern which data is provided in emergency calls, but
in general, the emergency call system is aided by the information
described in this document. There is a trade-off between the privacy
considerations and the utility of the data. For protection, this
specification requires all retrieval of data passed by reference to
be protected against eavesdropping and alteration via communication
security techniques (namely TLS). Furthermore, security safeguards
are required to prevent unauthorized access to stored data. Various
security incidents over at least the past few decades have shown that
data breaches are not uncommon and are often caused by lack of proper
access control frameworks, software bugs (such as buffer overflows),
or missing input parsing (such as SQL injection attacks). The risks
of data breaches have increased with the obligation for emergency
services to retain emergency-call-related data for extended periods
(e.g., several years are the norm).
Finally, it is also worth highlighting the nature of the SIP
communication architecture, which introduces additional complications
for privacy. Some forms of data can be sent by value in the SIP
signaling or by reference (a URL in the SIP signaling). When data is
sent by value, all intermediaries have access to the data. As such,
these intermediaries could also introduce additional privacy risk.
Therefore, in situations where the conveyed information is privacy
sensitive and intermediaries are involved, transmitting by reference
might be appropriate, assuming the source of the data can operate a
sufficient dereferencing infrastructure and that proper access
control policies are available for distinguishing the different
entities dereferencing the reference. Without access control
policies, any party in possession of the reference is able to resolve
the reference and to obtain the data, including intermediaries.
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11. IANA Considerations
11.1. Emergency Call Additional Data Registry
This document creates a new registry called 'Emergency Call
Additional Data' with a number of sub-registries.
For several of the sub-registries, "Expert Review" is the criteria
for adding new entries. As discussed in Section 5, it can be
counterproductive to register new types of data, and as discussed in
Section 10, data sent as part of an emergency call can be very
privacy sensitive. In some cases, it is anticipated that various
standards bodies dealing with emergency services might need to
register new values, and in those cases, text below advises the
designed expert to verify that the entity requesting the registration
is relevant (e.g., a recognized emergency-services-related Standards
Development Organization (SDO)). In other cases, especially those
where the trade-off between the potential benefit versus danger of
new registrations is more conservative (such as Section 11.1.9),
"Specification Required" is the criteria, which is a higher hurdle
and also implicitly includes an "Expert Review".
The following sub-registries are created for this registry.
11.1.1. Provider ID Series Registry
This document creates a new sub-registry called "Provider ID Series".
As defined in [RFC5226], this registry operates under "Expert Review"
rules. The expert should determine that the entity requesting a new
value is a legitimate issuer of service provider IDs suitable for use
in Additional Call Data.
Private entities issuing or using internally generated IDs are
encouraged to register here and to ensure that all IDs they issue or
use are unique. This guarantees that IDs issued or used by the
entity are globally unique and distinguishable from other IDs issued
or used by the same or a different entity. (Some organizations, such
as NENA, issue IDs that are unique among all IDs they issue, so an
entity using a combination of its NENA ID and the fact that it is
from NENA is globally unique. Other entities might not have an ID
issued by an organization such as NENA, so they are permitted to use
their domain name, but if so, it needs to be unique.)
The content of this registry includes:
Name: An identifier to be used in the 'ProviderIDSeries' element.
Source: The full name of the organization issuing the identifiers.
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URL: A URL to the organization for further information.
The initial set of values is listed in Figure 1.
11.1.2. Service Environment Registry
This document creates a new sub-registry called "Service
Environment". As defined in [RFC5226], this registry operates under
"Expert Review" rules. The expert should determine that the entity
requesting a new value is relevant for this service element (e.g., a
recognized emergency-services-related SDO) and that the new value is
distinct from existing values, and its use is unambiguous.
The content of this registry includes:
Token: The value to be used in the <ServiceEnvironment> element.
Description: A short description of the value.
The initial set of values is listed in Figure 4.
11.1.3. Service Type Registry
This document creates a new sub-registry called "Service Type". As
defined in [RFC5226], this registry operates under "Expert Review"
rules. The expert should determine that the entity requesting a new
value is relevant for this service element (e.g., a recognized
emergency-services-related SDO) and that the requested value is
clearly distinct from other values so that there is no ambiguity as
to when the value is to be used or which value is to be used.
The content of this registry includes:
Name: The value to be used in the <ServiceType> element.
Description: A short description of the value.
The initial set of values is listed in Figure 5.
11.1.4. Service Mobility Registry
This document creates a new sub-registry called "Service Mobility".
As defined in [RFC5226], this registry operates under "Expert Review"
rules. The expert should determine that the entity requesting a new
value is relevant for this service element (e.g., a recognized
emergency-services-related SDO) and that the requested value is
clearly distinct from other values so that there is no ambiguity as
to when the value is to be used or which value is to be used.
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The content of this registry includes:
Token: The value used in the <ServiceMobility> element.
Description: A short description of the value.
The initial set of values is listed in Figure 6.
11.1.5. Type of Provider Registry
This document creates a new sub-registry called "Type of Provider".
As defined in [RFC5226], this registry operates under "Expert Review"
rules. The expert should determine that the proposed new value is
distinct from existing values and appropriate for use in the
<TypeOfServicerProvider> element
The content of this registry includes:
Token: The value used in the <TypeOfProvider> element.
Description: A short description of the type of service provider.
The initial set of values is defined in Figure 2.
11.1.6. Device Classification Registry
This document creates a new sub-registry called "Device
Classification". As defined in [RFC5226], this registry operates
under "Expert Review" rules. The expert should consider whether the
proposed class is unique from existing classes, and the definition of
the class will be clear to implementors and PSAPs/responders.
The content of this registry includes:
Token: Value used in the <DeviceClassification> element.
Description: Short description identifying the device type.
The initial set of values is defined in Figure 8.
11.1.7. Device ID Type Registry
This document creates a new sub-registry called "Device ID Type". As
defined in [RFC5226], this registry operates under "Expert Review"
rules. The expert should ascertain that the proposed type is well
understood and provides information that PSAPs and responders are
able to use to uniquely identify a device. (For example, a biometric
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RFC 7852 Additional Call Data July 2016
fingerprint used to authenticate a device would not normally be used
by a PSAP or responder to identify a device.)
The content of this registry includes:
Token: The value to be placed in the <TypeOfDeviceID> element.
Description: Short description identifying the type of the device
ID.
The initial set of values is defined in Figure 9.
11.1.8. Device/Service Data Type Registry
This document creates a new sub-registry called "Device/Service Data
Type". As defined in [RFC5226], this registry operates under
"Specification Required" rules, which include an explicit "Expert
Review". The designated expert should ascertain that the proposed
type is well understood and provides information useful to PSAPs and
responders. The specification must contain a complete description of
the data and a precise format specification suitable to allow
interoperable implementations.
The content of this registry includes:
Token: The value to be placed in the <DeviceSpecificType> element.
Description: Short description identifying the data.
Specification: Citation for the specification of the data.
The initial set of values is listed in Figure 10.
11.1.9. Emergency Call Data Types Registry
This document creates a new sub-registry called "Emergency Call Data
Types". As defined in [RFC5226], this registry operates under
"Specification Required" rules, which include an explicit "Expert
Review". The expert is responsible for verifying that the document
contains a complete and clear specification, and the proposed
functionality does not obviously duplicate existing functionality.
The expert is also responsible for verifying that the block is
correctly categorized per the description of the categories in
Section 1.
The registry contains an entry for every data block that can be sent
with an emergency call using the mechanisms as specified in this
document. Each data block is identified by the 'root' of its MIME
Gellens, et al. Standards Track [Page 70]
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media subtype (which is the part after 'EmergencyCallData.'). If the
MIME media subtype does not start with 'EmergencyCallData.', then it
cannot be registered here nor used in a Call-Info header field as
specified in this document. The subtype MAY exist under any MIME
media type (although most commonly under 'application/', this is NOT
REQUIRED); however, to be added to the registry, the 'root' needs to
be unique regardless of the MIME media type.
The content of this registry includes:
Token: The root of the data's MIME media subtype (not including the
'EmergencyCallData' prefix and any suffix such as '+xml').
Data About: A hint as to if the block is considered descriptive of
the call, the caller, or the location (or is applicable to more
than one), which can help PSAPs and other entities determine if
they wish to process the block. Note that this is only a hint;
entities need to consider the block's contents, not just this
field, when determining if they wish to process the block (which
is why the field only exists in the registry and is not contained
within the block). The value MUST be either 'The Call', 'The
Caller', 'The Location', or 'Multiple'. New values are created by
extending this registry in a subsequent RFC.
Reference: The document that describes the data object.
Note that the tokens in this registry are part of the
'EmergencyCallData' compound value; when used as a value of the
'purpose' parameter of a Call-Info header field, the values listed in
this registry are prefixed by 'EmergencyCallData.' per the
'EmergencyCallData' registration; see Section 11.2.
The initial set of values is listed in Figure 25.
+----------------+--------------+------------+
| Token | Data About | Reference |
+----------------+--------------+------------+
| ProviderInfo | The Call | RFC 7852 |
| ServiceInfo | The Call | RFC 7852 |
| DeviceInfo | The Call | RFC 7852 |
| SubscriberInfo | The Call | RFC 7852 |
| Comment | The Call | RFC 7852 |
+----------------+--------------+------------+
Figure 25: Additional Data Blocks Registry
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11.2. 'EmergencyCallData' Purpose Parameter Value
This document defines the 'EmergencyCallData' value for the 'purpose'
parameter of the Call-Info header field [RFC3261]. IANA has added
this document to the list of references for the 'purpose' value of
Call-Info in the "Header Field Parameters and Parameter Values" sub-
registry of the "Session Initiation Protocol (SIP) Parameters"
registry. Note that 'EmergencyCallData' is a compound value; when
used as a value of the 'purpose' parameter of a Call-Info header
field, 'EmergencyCallData' is immediately followed by a dot ('.') and
a value from the "Emergency Call Data Types" registry; see
Section 11.1.9.
11.3. URN Sub-Namespace Registration for <provided-by> Registry Entry
This section registers the namespace specified in Section 11.5.1 in
the provided-by registry established by RFC 4119, for usage within
the <provided-by> element of a PIDF-LO.
The schema for the <provided-by> element used by this document is
specified in Section 8.6.
11.4. MIME Registrations
11.4.1. MIME Content-Type Registration for 'application/
EmergencyCallData.ProviderInfo+xml'
This specification requests the registration of a new MIME media type
according to the procedures of RFC 6838 [RFC6838] and guidelines in
RFC 7303 [RFC7303].
Type name: application
Subtype name: EmergencyCallData.ProviderInfo+xml
Mandatory parameters: N/A
Optional parameters: charset (indicates the character encoding of
the contents)
Encoding considerations: Uses XML, which can contain 8-bit
characters, depending on the character encoding. See Section 3.2
of RFC 7303 [RFC7303].
Security considerations: This content type is designed to carry
the data provider information, which is a sub-category of
additional data about an emergency call. Since this data can
contain personal information, appropriate precautions are needed
Gellens, et al. Standards Track [Page 72]
RFC 7852 Additional Call Data July 2016
to limit unauthorized access, inappropriate disclosure, and
eavesdropping of personal information. Please refer to Sections 9
and 10 for more information.
Interoperability considerations: N/A
Published specification: RFC 7852
Applications that use this media type: Emergency Services
Additional information:
Magic Number: N/A
File Extension: .xml
Macintosh file type code: 'TEXT'
Person and email address for further information:
Hannes Tschofenig, Hannes.Tschofenig@gmx.net
Intended usage: LIMITED USE
Author: This specification is a work item of the IETF ECRIT
working group, with mailing list address <ecrit@ietf.org>.
Change controller: The IESG <iesg@ietf.org>
11.4.2. MIME Content-Type Registration for 'application/
EmergencyCallData.ServiceInfo+xml'
This specification requests the registration of a new MIME media type
according to the procedures of RFC 6838 [RFC6838] and guidelines in
RFC 7303 [RFC7303].
Type name: application
Subtype name: EmergencyCallData.ServiceInfo+xml
Mandatory parameters: N/A
Optional parameters: charset (indicates the character encoding of
the contents)
Encoding considerations: Uses XML, which can contain 8-bit
characters, depending on the character encoding. See Section 3.2
of RFC 7303 [RFC7303].
Gellens, et al. Standards Track [Page 73]
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Security considerations: This content type is designed to carry
the service information, which is a sub-category of additional
data about an emergency call. Since this data can contain
personal information, appropriate precautions are needed to limit
unauthorized access, inappropriate disclosure, and eavesdropping
of personal information. Please refer to Sections 9 and 10 for
more information.
Interoperability considerations: N/A
Published specification: RFC 7852
Applications that use this media type: Emergency Services
Additional information:
Magic Number: N/A
File Extension: .xml
Macintosh file type code: 'TEXT'
Person and email address for further information:
Hannes Tschofenig, Hannes.Tschofenig@gmx.net
Intended usage: LIMITED USE
Author: This specification is a work item of the IETF ECRIT
working group, with mailing list address <ecrit@ietf.org>.
Change controller: The IESG <iesg@ietf.org>
11.4.3. MIME Content-Type Registration for 'application/
EmergencyCallData.DeviceInfo+xml'
This specification requests the registration of a new MIME media type
according to the procedures of RFC 6838 [RFC6838] and guidelines in
RFC 7303 [RFC7303].
Type name: application
Subtype name: EmergencyCallData.DeviceInfo+xml
Mandatory parameters: N/A
Optional parameters: charset (indicates the character encoding of
the contents)
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RFC 7852 Additional Call Data July 2016
Encoding considerations: Uses XML, which can contain 8-bit
characters, depending on the character encoding. See Section 3.2
of RFC 7303 [RFC7303].
Security considerations: This content type is designed to carry
device information, which is a sub-category of additional data
about an emergency call. Since this data contains personal
information, appropriate precautions need to be taken to limit
unauthorized access, inappropriate disclosure to third parties,
and eavesdropping of this information. Please refer to Sections 9
and 10 for more information.
Interoperability considerations: N/A
Published specification: RFC 7852
Applications that use this media type: Emergency Services
Additional information:
Magic Number: N/A
File Extension: .xml
Macintosh file type code: 'TEXT'
Person and email address for further information:
Hannes Tschofenig, Hannes.Tschofenig@gmx.net
Intended usage: LIMITED USE
Author: This specification is a work item of the IETF ECRIT
working group, with mailing list address <ecrit@ietf.org>.
Change controller: The IESG <iesg@ietf.org>
11.4.4. MIME Content-Type Registration for 'application/
EmergencyCallData.SubscriberInfo+xml'
This specification requests the registration of a new MIME media type
according to the procedures of RFC 6838 [RFC6838] and guidelines in
RFC 7303 [RFC7303].
Type name: application
Subtype name: EmergencyCallData.SubscriberInfo+xml
Mandatory parameters: N/A
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RFC 7852 Additional Call Data July 2016
Optional parameters: charset (indicates the character encoding of
the contents)
Encoding considerations: Uses XML, which can contain 8-bit
characters, depending on the character encoding. See Section 3.2
of RFC 7303 [RFC7303].
Security considerations: This content type is designed to carry
owner/subscriber information, which is a sub-category of
additional data about an emergency call. Since this data contains
personal information, appropriate precautions need to be taken to
limit unauthorized access, inappropriate disclosure to third
parties, and eavesdropping of this information. Please refer to
Sections 9 and 10 for more information.
Interoperability considerations: N/A
Published specification: RFC 7852
Applications that use this media type: Emergency Services
Additional information:
Magic Number: N/A
File Extension: .xml
Macintosh file type code: 'TEXT'
Person and email address for further information:
Hannes Tschofenig, Hannes.Tschofenig@gmx.net
Intended usage: LIMITED USE
Author: This specification is a work item of the IETF ECRIT
working group, with mailing list address <ecrit@ietf.org>.
Change controller: The IESG <iesg@ietf.org>
11.4.5. MIME Content-Type Registration for 'application/
EmergencyCallData.Comment+xml'
This specification requests the registration of a new MIME media type
according to the procedures of RFC 6838 [RFC6838] and guidelines in
RFC 7303 [RFC7303].
Type name: application
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RFC 7852 Additional Call Data July 2016
Subtype name: EmergencyCallData.Comment+xml
Mandatory parameters: N/A
Optional parameters: charset (indicates the character encoding of
the contents)
Encoding considerations: Uses XML, which can contain 8-bit
characters, depending on the character encoding. See Section 3.2
of RFC 7303 [RFC7303].
Security considerations: This content type is designed to carry a
comment, which is a sub-category of additional data about an
emergency call. This data can contain personal information.
Appropriate precautions are needed to limit unauthorized access,
inappropriate disclosure to third parties, and eavesdropping of
this information. Please refer to Sections 9 and 10 for more
information.
Interoperability considerations: N/A
Published specification: RFC 7852
Applications that use this media type: Emergency Services
Additional information:
Magic Number: N/A
File Extension: .xml
Macintosh file type code: 'TEXT'
Person and email address for further information:
Hannes Tschofenig, Hannes.Tschofenig@gmx.net
Intended usage: LIMITED USE
Author: This specification is a work item of the IETF ECRIT
working group, with mailing list address <ecrit@ietf.org>.
Change controller: The IESG <iesg@ietf.org>
Gellens, et al. Standards Track [Page 77]
RFC 7852 Additional Call Data July 2016
11.5. URN Sub-Namespace Registration
11.5.1. Registration for urn:ietf:params:xml:ns:EmergencyCallData
This section registers a new XML namespace, as per the guidelines in
RFC 3688 [RFC3688].
URI: urn:ietf:params:xml:ns:EmergencyCallData
Registrant Contact: IETF, ECRIT working group, <ecrit@ietf.org>, as
delegated by the IESG <iesg@ietf.org>.
XML:
BEGIN
<?xml version="1.0"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML Basic 1.0//EN"
"http://www.w3.org/TR/xhtml-basic/xhtml-basic10.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="content-type"
content="text/html;charset=iso-8859-1"/>
<title>Namespace for Additional Emergency Call Data</title>
</head>
<body>
<h1>Namespace for Additional Data Related to an Emergency Call
</h1>
<p>See <a href="http://www.rfc-editor.org/rfc/rfc7852.txt">
RFC 7852</a>.</p>
</body>
</html>
END
11.5.2. Registration for
urn:ietf:params:xml:ns:EmergencyCallData:ProviderInfo
This section registers a new XML namespace, as per the guidelines in
RFC 3688 [RFC3688].
URI: urn:ietf:params:xml:ns:EmergencyCallData:ProviderInfo
Registrant Contact: IETF, ECRIT working group, <ecrit@ietf.org>, as
delegated by the IESG <iesg@ietf.org>.
Gellens, et al. Standards Track [Page 78]
RFC 7852 Additional Call Data July 2016
XML:
BEGIN
<?xml version="1.0"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML Basic 1.0//EN"
"http://www.w3.org/TR/xhtml-basic/xhtml-basic10.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="content-type"
content="text/html;charset=iso-8859-1"/>
<title>Namespace for Additional Emergency Call Data:
Data Provider Information</title>
</head>
<body>
<h1>Namespace for Additional Data Related to an Emergency Call
</h1>
<h2>Data Provider Information</h2>
<p>See <a href="http://www.rfc-editor.org/rfc/rfc7852.txt">
RFC 7852</a>.</p>
</body>
</html>
END
11.5.3. Registration for
urn:ietf:params:xml:ns:EmergencyCallData:ServiceInfo
This section registers a new XML namespace, as per the guidelines in
RFC 3688 [RFC3688].
URI: urn:ietf:params:xml:ns:EmergencyCallData:ServiceInfo
Registrant Contact: IETF, ECRIT working group, <ecrit@ietf.org>, as
delegated by the IESG <iesg@ietf.org>.
XML:
BEGIN
<?xml version="1.0"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML Basic 1.0//EN"
"http://www.w3.org/TR/xhtml-basic/xhtml-basic10.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="content-type"
content="text/html;charset=iso-8859-1"/>
<title>Namespace for Additional Emergency Call Data:
Service Information</title>
</head>
<body>
Gellens, et al. Standards Track [Page 79]
RFC 7852 Additional Call Data July 2016
<h1>Namespace for Additional Data Related to an Emergency Call
</h1>
<h2>Service Information</h2>
<p>See <a href="http://www.rfc-editor.org/rfc/rfc7852.txt">
RFC 7852</a>.</p>
</body>
</html>
END
11.5.4. Registration for
urn:ietf:params:xml:ns:EmergencyCallData:DeviceInfo
This section registers a new XML namespace, as per the guidelines in
RFC 3688 [RFC3688].
URI: urn:ietf:params:xml:ns:EmergencyCallData:DeviceInfo
Registrant Contact: IETF, ECRIT working group, <ecrit@ietf.org>, as
delegated by the IESG <iesg@ietf.org>.
XML:
BEGIN
<?xml version="1.0"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML Basic 1.0//EN"
"http://www.w3.org/TR/xhtml-basic/xhtml-basic10.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="content-type"
content="text/html;charset=iso-8859-1"/>
<title>Namespace for Additional Emergency Call Data:
Device Information</title>
</head>
<body>
<h1>Namespace for Additional Data Related to an Emergency Call
</h1>
<h2>Device Information</h2>
<p>See <a href="http://www.rfc-editor.org/rfc/rfc7852.txt">
RFC 7852</a>.</p>
</body>
</html>
END
Gellens, et al. Standards Track [Page 80]
RFC 7852 Additional Call Data July 2016
11.5.5. Registration for
urn:ietf:params:xml:ns:EmergencyCallData:SubscriberInfo
This section registers a new XML namespace, as per the guidelines in
RFC 3688 [RFC3688].
URI: urn:ietf:params:xml:ns:EmergencyCallData:SubscriberInfo
Registrant Contact: IETF, ECRIT working group, <ecrit@ietf.org>, as
delegated by the IESG <iesg@ietf.org>.
XML:
BEGIN
<?xml version="1.0"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML Basic 1.0//EN"
"http://www.w3.org/TR/xhtml-basic/xhtml-basic10.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="content-type"
content="text/html;charset=iso-8859-1"/>
<title>Namespace for Additional Emergency Call Data:
Owner/Subscriber Information</title>
</head>
<body>
<h1>Namespace for Additional Data Related to an Emergency Call
</h1>
<h2> Owner/Subscriber Information</h2>
<p>See <a href="http://www.rfc-editor.org/rfc/rfc7852.txt">
RFC 7852</a>.</p>
</body>
</html>
END
11.5.6. Registration for
urn:ietf:params:xml:ns:EmergencyCallData:Comment
This section registers a new XML namespace, as per the guidelines in
RFC 3688 [RFC3688].
URI: urn:ietf:params:xml:ns:EmergencyCallData:Comment
Registrant Contact: IETF, ECRIT working group, <ecrit@ietf.org>, as
delegated by the IESG <iesg@ietf.org>.
Gellens, et al. Standards Track [Page 81]
RFC 7852 Additional Call Data July 2016
XML:
BEGIN
<?xml version="1.0"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML Basic 1.0//EN"
"http://www.w3.org/TR/xhtml-basic/xhtml-basic10.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="content-type"
content="text/html;charset=iso-8859-1"/>
<title>Namespace for Additional Emergency Call Data:Comment
</title>
</head>
<body>
<h1>Namespace for Additional Data Related to an Emergency Call
</h1>
<h2> Comment</h2>
<p>See <a href="http://www.rfc-editor.org/rfc/rfc7852.txt">
RFC 7852</a>.</p>
</body>
</html>
END
11.6. Schema Registrations
This specification registers the following schemas, as per the
guidelines in RFC 3688 [RFC3688].
ID: EmergencyCallData
URI: urn:ietf:params:xml:schema:EmergencyCallData
Registrant Contact: IETF, ECRIT Working Group (ecrit@ietf.org), as
delegated by the IESG (iesg@ietf.org).
XML: The XML schema can be found in Section 8.6.
ID: EmergencyCallData:ProviderInfo
URI: urn:ietf:params:xml:schema:EmergencyCallData:ProviderInfo
Registrant Contact: IETF, ECRIT working group (ecrit@ietf.org), as
delegated by the IESG (iesg@ietf.org).
XML: The XML schema can be found in Figure 19.
ID: EmergencyCallData:ServiceInfo
URI: urn:ietf:params:xml:schema:EmergencyCallData:ServiceInfo
Registrant Contact: IETF, ECRIT working group (ecrit@ietf.org), as
delegated by the IESG (iesg@ietf.org).
XML: The XML schema can be found in Figure 20.
Gellens, et al. Standards Track [Page 82]
RFC 7852 Additional Call Data July 2016
ID: EmergencyCallData:DeviceInfo
URI: urn:ietf:params:xml:schema:EmergencyCallData:DeviceInfo
Registrant Contact: IETF, ECRIT working group (ecrit@ietf.org), as
delegated by the IESG (iesg@ietf.org).
XML: The XML schema can be found in Figure 21.
ID: EmergencyCallData:SubscriberInfo
URI: urn:ietf:params:xml:schema:EmergencyCallData:SubscriberInfo
Registrant Contact: IETF, ECRIT working group (ecrit@ietf.org), as
delegated by the IESG (iesg@ietf.org).
XML: The XML schema can be found in Section 8.4.
ID: EmergencyCallData:Comment
URI: urn:ietf:params:xml:schema:EmergencyCallData:Comment
Registrant Contact: IETF, ECRIT working group (ecrit@ietf.org), as
delegated by the IESG (iesg@ietf.org).
XML: The XML schema can be found in Section 8.5.
ID: vcard-4.0
URI: urn:ietf:params:xml:ns:vcard-4.0
Registrant Contact: IETF, ECRIT Working Group (ecrit@ietf.org), as
delegated by the IESG (iesg@ietf.org).
XML: The XML schema can be found in Appendix A.
11.7. vCard Parameter Value Registration
This document registers a new value in the "vCard Parameter Values"
registry as defined by [RFC6350] with the following template:
Value: main-number
Purpose: The main telephone number, typically of an enterprise, as
opposed to a direct-dial number of an individual employee
Conformance: This value can be used with the 'TYPE' parameter
applied on the 'TEL' property
Example(s): TEL;VALUE=uri;TYPE="main,voice";PREF=1:tel:+1-418-656-90
00
Gellens, et al. Standards Track [Page 83]
RFC 7852 Additional Call Data July 2016
12. References
12.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<http://www.rfc-editor.org/info/rfc2119>.
[RFC2392] Levinson, E., "Content-ID and Message-ID Uniform Resource
Locators", RFC 2392, DOI 10.17487/RFC2392, August 1998,
<http://www.rfc-editor.org/info/rfc2392>.
[RFC3204] Zimmerer, E., Peterson, J., Vemuri, A., Ong, L., Audet,
F., Watson, M., and M. Zonoun, "MIME media types for ISUP
and QSIG Objects", RFC 3204, DOI 10.17487/RFC3204,
December 2001, <http://www.rfc-editor.org/info/rfc3204>.
[RFC3261] Rosenberg, J., Schulzrinne, H., Camarillo, G., Johnston,
A., Peterson, J., Sparks, R., Handley, M., and E.
Schooler, "SIP: Session Initiation Protocol", RFC 3261,
DOI 10.17487/RFC3261, June 2002,
<http://www.rfc-editor.org/info/rfc3261>.
[RFC3459] Burger, E., "Critical Content Multi-purpose Internet Mail
Extensions (MIME) Parameter", RFC 3459,
DOI 10.17487/RFC3459, January 2003,
<http://www.rfc-editor.org/info/rfc3459>.
[RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
DOI 10.17487/RFC3688, January 2004,
<http://www.rfc-editor.org/info/rfc3688>.
[RFC3966] Schulzrinne, H., "The tel URI for Telephone Numbers",
RFC 3966, DOI 10.17487/RFC3966, December 2004,
<http://www.rfc-editor.org/info/rfc3966>.
[RFC4119] Peterson, J., "A Presence-based GEOPRIV Location Object
Format", RFC 4119, DOI 10.17487/RFC4119, December 2005,
<http://www.rfc-editor.org/info/rfc4119>.
[RFC5226] Narten, T. and H. Alvestrand, "Guidelines for Writing an
IANA Considerations Section in RFCs", BCP 26, RFC 5226,
DOI 10.17487/RFC5226, May 2008,
<http://www.rfc-editor.org/info/rfc5226>.
Gellens, et al. Standards Track [Page 84]
RFC 7852 Additional Call Data July 2016
[RFC5322] Resnick, P., Ed., "Internet Message Format", RFC 5322,
DOI 10.17487/RFC5322, October 2008,
<http://www.rfc-editor.org/info/rfc5322>.
[RFC5621] Camarillo, G., "Message Body Handling in the Session
Initiation Protocol (SIP)", RFC 5621,
DOI 10.17487/RFC5621, September 2009,
<http://www.rfc-editor.org/info/rfc5621>.
[RFC5646] Phillips, A., Ed. and M. Davis, Ed., "Tags for Identifying
Languages", BCP 47, RFC 5646, DOI 10.17487/RFC5646,
September 2009, <http://www.rfc-editor.org/info/rfc5646>.
[RFC6350] Perreault, S., "vCard Format Specification", RFC 6350,
DOI 10.17487/RFC6350, August 2011,
<http://www.rfc-editor.org/info/rfc6350>.
[RFC6351] Perreault, S., "xCard: vCard XML Representation",
RFC 6351, DOI 10.17487/RFC6351, August 2011,
<http://www.rfc-editor.org/info/rfc6351>.
[RFC6838] Freed, N., Klensin, J., and T. Hansen, "Media Type
Specifications and Registration Procedures", BCP 13,
RFC 6838, DOI 10.17487/RFC6838, January 2013,
<http://www.rfc-editor.org/info/rfc6838>.
[RFC7303] Thompson, H. and C. Lilley, "XML Media Types", RFC 7303,
DOI 10.17487/RFC7303, July 2014,
<http://www.rfc-editor.org/info/rfc7303>.
12.2. Informative References
[ECRIT-WG-wiki]
IETF ECRIT WG Wiki, "Additional Data Examples", July 2015,
<http://tools.ietf.org/wg/ecrit/trac/attachment/wiki/
WikiStart/additional-data-examples.zip>.
[Err3047] RFC Errata, Erratum ID 3047, RFC 6351.
[HUMAN-LANG]
Gellens, R., "Negotiating Human Language in Real-Time
Communications", Work in Progress, draft-ietf-slim-
negotiating-human-language-04, July 2016.
[IANA-XML-Schemas]
IANA, "IETF XML Registry",
<http://www.iana.org/assignments/xml-registry>.
Gellens, et al. Standards Track [Page 85]
RFC 7852 Additional Call Data July 2016
[IEEE-1512-2006]
IEEE, "IEEE Standard for Common Incident Management
Message Sets for Use by Emergency Management Centers",
IEEE Std 1512-2006, DOI 10.1109/IEEESTD.2006.224678,
August 2006, <https://standards.ieee.org/findstds/
standard/1512-2006.html>.
[LanguageSubtagRegistry]
IANA, "Language Subtag Registry",
<http://www.iana.org/assignments/
language-subtag-registry>.
[LERG] Telcordia Technologies, Inc., "LERG Routing Guide", ANI
II Digits Definitions, June 2015.
[NANP] North American Numbering Plan Administration (NANPA), "ANI
II Digits Assignments", September 2015,
<http://nanpa.com/number_resource_info/
ani_ii_assignments.html>.
[nc911] North Carolina 911 Board, "Wireless 911 for
Telecommunicators", January 2009,
<https://www.nc911.nc.gov/pdf/
A_TelecommunicatorReference.pdf>.
[NENA-02-010]
National Emergency Number Association (NENA), "NENA
Standard Data Formats for 9-1-1 Data Exchange & GIS
Mapping", NENA-02-010, Version 9, December 2010,
<http://www.nena.org>.
[RFC3325] Jennings, C., Peterson, J., and M. Watson, "Private
Extensions to the Session Initiation Protocol (SIP) for
Asserted Identity within Trusted Networks", RFC 3325,
DOI 10.17487/RFC3325, November 2002,
<http://www.rfc-editor.org/info/rfc3325>.
[RFC3840] Rosenberg, J., Schulzrinne, H., and P. Kyzivat,
"Indicating User Agent Capabilities in the Session
Initiation Protocol (SIP)", RFC 3840,
DOI 10.17487/RFC3840, August 2004,
<http://www.rfc-editor.org/info/rfc3840>.
[RFC5012] Schulzrinne, H. and R. Marshall, Ed., "Requirements for
Emergency Context Resolution with Internet Technologies",
RFC 5012, DOI 10.17487/RFC5012, January 2008,
<http://www.rfc-editor.org/info/rfc5012>.
Gellens, et al. Standards Track [Page 86]
RFC 7852 Additional Call Data July 2016
[RFC5139] Thomson, M. and J. Winterbottom, "Revised Civic Location
Format for Presence Information Data Format Location
Object (PIDF-LO)", RFC 5139, DOI 10.17487/RFC5139,
February 2008, <http://www.rfc-editor.org/info/rfc5139>.
[RFC5491] Winterbottom, J., Thomson, M., and H. Tschofenig, "GEOPRIV
Presence Information Data Format Location Object (PIDF-LO)
Usage Clarification, Considerations, and Recommendations",
RFC 5491, DOI 10.17487/RFC5491, March 2009,
<http://www.rfc-editor.org/info/rfc5491>.
[RFC5582] Schulzrinne, H., "Location-to-URL Mapping Architecture and
Framework", RFC 5582, DOI 10.17487/RFC5582, September
2009, <http://www.rfc-editor.org/info/rfc5582>.
[RFC5962] Schulzrinne, H., Singh, V., Tschofenig, H., and M.
Thomson, "Dynamic Extensions to the Presence Information
Data Format Location Object (PIDF-LO)", RFC 5962,
DOI 10.17487/RFC5962, September 2010,
<http://www.rfc-editor.org/info/rfc5962>.
[RFC5985] Barnes, M., Ed., "HTTP-Enabled Location Delivery (HELD)",
RFC 5985, DOI 10.17487/RFC5985, September 2010,
<http://www.rfc-editor.org/info/rfc5985>.
[RFC6443] Rosen, B., Schulzrinne, H., Polk, J., and A. Newton,
"Framework for Emergency Calling Using Internet
Multimedia", RFC 6443, DOI 10.17487/RFC6443, December
2011, <http://www.rfc-editor.org/info/rfc6443>.
[RFC6698] Hoffman, P. and J. Schlyter, "The DNS-Based Authentication
of Named Entities (DANE) Transport Layer Security (TLS)
Protocol: TLSA", RFC 6698, DOI 10.17487/RFC6698, August
2012, <http://www.rfc-editor.org/info/rfc6698>.
[RFC6848] Winterbottom, J., Thomson, M., Barnes, R., Rosen, B., and
R. George, "Specifying Civic Address Extensions in the
Presence Information Data Format Location Object (PIDF-
LO)", RFC 6848, DOI 10.17487/RFC6848, January 2013,
<http://www.rfc-editor.org/info/rfc6848>.
[RFC6881] Rosen, B. and J. Polk, "Best Current Practice for
Communications Services in Support of Emergency Calling",
BCP 181, RFC 6881, DOI 10.17487/RFC6881, March 2013,
<http://www.rfc-editor.org/info/rfc6881>.
Gellens, et al. Standards Track [Page 87]
RFC 7852 Additional Call Data July 2016
[RFC6973] Cooper, A., Tschofenig, H., Aboba, B., Peterson, J.,
Morris, J., Hansen, M., and R. Smith, "Privacy
Considerations for Internet Protocols", RFC 6973,
DOI 10.17487/RFC6973, July 2013,
<http://www.rfc-editor.org/info/rfc6973>.
[RFC7035] Thomson, M., Rosen, B., Stanley, D., Bajko, G., and A.
Thomson, "Relative Location Representation", RFC 7035,
DOI 10.17487/RFC7035, October 2013,
<http://www.rfc-editor.org/info/rfc7035>.
[RFC7090] Schulzrinne, H., Tschofenig, H., Holmberg, C., and M.
Patel, "Public Safety Answering Point (PSAP) Callback",
RFC 7090, DOI 10.17487/RFC7090, April 2014,
<http://www.rfc-editor.org/info/rfc7090>.
[RFC7525] Sheffer, Y., Holz, R., and P. Saint-Andre,
"Recommendations for Secure Use of Transport Layer
Security (TLS) and Datagram Transport Layer Security
(DTLS)", BCP 195, RFC 7525, DOI 10.17487/RFC7525, May
2015, <http://www.rfc-editor.org/info/rfc7525>.
Gellens, et al. Standards Track [Page 88]
RFC 7852 Additional Call Data July 2016
Appendix A. XML Schema for vCard/xCard
This section contains the vCard/xCard XML schema version of the Relax
NG schema defined in RFC 6351 [RFC6351] for use with the XML schemas
defined in this document. In addition to mapping the Relax NG schema
to an XML schema, this specification applies an erratum raised for
RFC 6351 regarding the type definition; see RFC Erratum ID 3047
[Err3047].
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema
targetNamespace="urn:ietf:params:xml:ns:vcard-4.0"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:ns1="urn:ietf:params:xml:ns:vcard-4.0"
elementFormDefault="qualified">
<!--
3.3
iana-token = xsd:string { pattern = "[a-zA-Z0-9-]+" }
x-name = xsd:string { pattern = "x-[a-zA-Z0-9-]+" }
-->
<xs:simpleType name="iana-token">
<xs:annotation>
<xs:documentation>Section 3.3: vCard Format Specification
</xs:documentation>
</xs:annotation>
<xs:restriction base="xs:string"/>
</xs:simpleType>
<xs:simpleType name="x-name">
<xs:restriction base="xs:string"/>
</xs:simpleType>
<!--
4.1
-->
<xs:element name="text" type="xs:string"/>
<xs:group name="value-text-list">
<xs:sequence>
<xs:element ref="ns1:text" maxOccurs="unbounded"/>
</xs:sequence>
</xs:group>
<!-- 4.2 -->
<xs:element name="uri" type="xs:anyURI"/>
<!-- 4.3.1 -->
<xs:element name="date"
substitutionGroup="ns1:value-date-and-or-time">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:pattern
value="\d{8}|\d{4}-\d\d|--\d\d(\d\d)?|---\d\d"/>
Gellens, et al. Standards Track [Page 89]
RFC 7852 Additional Call Data July 2016
</xs:restriction>
</xs:simpleType>
</xs:element>
<!-- 4.3.2 -->
<xs:element name="time"
substitutionGroup="ns1:value-date-and-or-time">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:pattern value=
"(\d\d(\d\d(\d\d)?)?|-\d\d(\d\d?)|--\d\d)(Z|[+\-]\d\d(\d\d)?)?"/>
</xs:restriction>
</xs:simpleType>
</xs:element>
<!-- 4.3.3 -->
<xs:element name="date-time"
substitutionGroup="ns1:value-date-and-or-time">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:pattern value=
"(\d{8}|--\d{4}|---\d\d)T\d\d(\d\d(\d\d)?)?(Z|[+\-]\d\d(\d\d)?)?"/>
</xs:restriction>
</xs:simpleType>
</xs:element>
<!-- 4.3.4 -->
<xs:element name="value-date-and-or-time" abstract="true"/>
<!-- 4.3.5 -->
<xs:complexType name="value-timestamp">
<xs:sequence>
<xs:element ref="ns1:timestamp"/>
</xs:sequence>
</xs:complexType>
<xs:element name="timestamp">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:pattern value="\d{8}T\d{6}(Z|[+\-]\d\d(\d\d)?)?"/>
</xs:restriction>
</xs:simpleType>
</xs:element>
<!-- 4.4 -->
<xs:element name="boolean" type="xs:boolean"/>
<!-- 4.5 -->
<xs:element name="integer" type="xs:integer"/>
<!-- 4.6 -->
<xs:element name="float" type="xs:float"/>
<!-- 4.7 -->
<xs:element name="utc-offset">
<xs:simpleType>
<xs:restriction base="xs:string">
Gellens, et al. Standards Track [Page 90]
RFC 7852 Additional Call Data July 2016
<xs:pattern value="[+\-]\d\d(\d\d)?"/>
</xs:restriction>
</xs:simpleType>
</xs:element>
<!-- 4.8 -->
<xs:element name="language-tag">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:pattern value=
"([a-z]{2,3}((-[a-z]{3}){0,3})?|[a-z]{4,8})(-[a-z]{4})?
(-([a-z]{2}|\d{3}))?(-([0-9a-z]{5,8}|\d[0-9a-z]{3}))*
(-[0-9a-wyz](-[0-9a-z]{2,8})+)*(-x(-[0-9a-z]{1,8})+)?
|x(-[0-9a-z]{1,8})+|[a-z]{1,3}(-[0-9a-z]{2,8}){1,2}"/>
</xs:restriction>
</xs:simpleType>
</xs:element>
<!--
5.1
-->
<xs:group name="param-language">
<xs:annotation>
<xs:documentation>Section 5: Parameters</xs:documentation>
</xs:annotation>
<xs:sequence>
<xs:element ref="ns1:language" minOccurs="0"/>
</xs:sequence>
</xs:group>
<xs:element name="language">
<xs:complexType>
<xs:sequence>
<xs:element ref="ns1:language-tag"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<!-- 5.2 -->
<xs:group name="param-pref">
<xs:sequence>
<xs:element ref="ns1:pref" minOccurs="0"/>
</xs:sequence>
</xs:group>
<xs:element name="pref">
<xs:complexType>
<xs:sequence>
<xs:element name="integer">
<xs:simpleType>
<xs:restriction base="xs:integer">
<xs:minInclusive value="1"/>
<xs:maxInclusive value="100"/>
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</xs:restriction>
</xs:simpleType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
<!-- 5.4 -->
<xs:group name="param-altid">
<xs:sequence>
<xs:element ref="ns1:altid" minOccurs="0"/>
</xs:sequence>
</xs:group>
<xs:element name="altid">
<xs:complexType>
<xs:sequence>
<xs:element ref="ns1:text"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<!-- 5.5 -->
<xs:group name="param-pid">
<xs:sequence>
<xs:element ref="ns1:pid" minOccurs="0"/>
</xs:sequence>
</xs:group>
<xs:element name="pid">
<xs:complexType>
<xs:sequence>
<xs:element name="text" maxOccurs="unbounded">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:pattern value="\d+(\.\d+)?"/>
</xs:restriction>
</xs:simpleType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
<!-- 5.6 -->
<xs:group name="param-type">
<xs:sequence>
<xs:element ref="ns1:type" minOccurs="0"/>
</xs:sequence>
</xs:group>
<xs:element name="type">
<xs:complexType>
<xs:sequence>
<xs:element name="text" maxOccurs="unbounded">
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<xs:simpleType>
<xs:restriction base="xs:token">
<xs:enumeration value="work"/>
<xs:enumeration value="home"/>
</xs:restriction>
</xs:simpleType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
<!-- 5.7 -->
<xs:group name="param-mediatype">
<xs:sequence>
<xs:element ref="ns1:mediatype" minOccurs="0"/>
</xs:sequence>
</xs:group>
<xs:element name="mediatype">
<xs:complexType>
<xs:sequence>
<xs:element ref="ns1:text"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<!-- 5.8 -->
<xs:group name="param-calscale">
<xs:sequence>
<xs:element ref="ns1:calscale" minOccurs="0"/>
</xs:sequence>
</xs:group>
<xs:element name="calscale">
<xs:complexType>
<xs:sequence>
<xs:element name="text">
<xs:simpleType>
<xs:restriction base="xs:token">
<xs:enumeration value="gregorian"/>
</xs:restriction>
</xs:simpleType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
<!-- 5.9 -->
<xs:group name="param-sort-as">
<xs:sequence>
<xs:element ref="ns1:sort-as" minOccurs="0"/>
</xs:sequence>
</xs:group>
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<xs:element name="sort-as">
<xs:complexType>
<xs:sequence>
<xs:element ref="ns1:text" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<!-- 5.10 -->
<xs:group name="param-geo">
<xs:sequence>
<xs:element name="geo" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:element ref="ns1:uri"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:group>
<!-- 5.11 -->
<xs:group name="param-tz">
<xs:sequence>
<xs:element name="tz" minOccurs="0">
<xs:complexType>
<xs:choice>
<xs:element ref="ns1:text"/>
<xs:element ref="ns1:uri"/>
</xs:choice>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:group>
<!--
6.1.3
-->
<xs:element name="source">
<xs:complexType>
<xs:sequence>
<xs:element name="parameters">
<xs:complexType>
<xs:sequence>
<xs:group ref="ns1:param-altid"/>
<xs:group ref="ns1:param-pid"/>
<xs:group ref="ns1:param-pref"/>
<xs:group ref="ns1:param-mediatype"/>
</xs:sequence>
</xs:complexType>
</xs:element>
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<xs:element ref="ns1:uri"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<!-- 6.1.4 -->
<xs:element name="kind">
<xs:complexType>
<xs:sequence>
<xs:annotation>
<xs:documentation>
The text value must be one of: individual, group, org,
location or a ns1:x-name or a ns1:iana-token value
</xs:documentation>
</xs:annotation>
<xs:element name="text" type="xs:token"
minOccurs="1" maxOccurs="1"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<!-- 6.2.1 -->
<xs:element name="fn">
<xs:complexType>
<xs:sequence>
<xs:element name="parameters" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:group ref="ns1:param-language"/>
<xs:group ref="ns1:param-altid"/>
<xs:group ref="ns1:param-pid"/>
<xs:group ref="ns1:param-pref"/>
<xs:group ref="ns1:param-type"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element ref="ns1:text"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<!-- 6.2.2 -->
<xs:element name="n">
<xs:complexType>
<xs:sequence>
<xs:element name="parameters" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:group ref="ns1:param-language"/>
<xs:group ref="ns1:param-sort-as"/>
<xs:group ref="ns1:param-altid"/>
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</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element ref="ns1:surname"
minOccurs="0" maxOccurs="unbounded"/>
<xs:element ref="ns1:given"
minOccurs="0" maxOccurs="unbounded"/>
<xs:element ref="ns1:additional"
minOccurs="0" maxOccurs="unbounded"/>
<xs:element ref="ns1:prefix"
minOccurs="0" maxOccurs="unbounded"/>
<xs:element ref="ns1:suffix"
minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="surname" type="xs:string"/>
<xs:element name="given" type="xs:string"/>
<xs:element name="additional" type="xs:string"/>
<xs:element name="prefix" type="xs:string"/>
<xs:element name="suffix" type="xs:string"/>
<!-- 6.2.3 -->
<xs:element name="nickname">
<xs:complexType>
<xs:sequence>
<xs:element name="parameters" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:group ref="ns1:param-language"/>
<xs:group ref="ns1:param-altid"/>
<xs:group ref="ns1:param-pid"/>
<xs:group ref="ns1:param-pref"/>
<xs:group ref="ns1:param-type"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:group ref="ns1:value-text-list"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<!-- 6.2.4 -->
<xs:element name="photo">
<xs:complexType>
<xs:sequence>
<xs:element name="parameters" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:group ref="ns1:param-altid"/>
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<xs:group ref="ns1:param-pid"/>
<xs:group ref="ns1:param-pref"/>
<xs:group ref="ns1:param-type"/>
<xs:group ref="ns1:param-mediatype"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element ref="ns1:uri"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<!-- 6.2.5 -->
<xs:element name="bday">
<xs:complexType>
<xs:sequence>
<xs:element name="parameters" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:group ref="ns1:param-altid"/>
<xs:group ref="ns1:param-calscale"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:choice>
<xs:element ref="ns1:value-date-and-or-time"/>
<xs:element ref="ns1:text"/>
</xs:choice>
</xs:sequence>
</xs:complexType>
</xs:element>
<!-- 6.2.6 -->
<xs:element name="anniversary">
<xs:complexType>
<xs:sequence>
<xs:element name="parameters" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:group ref="ns1:param-altid"/>
<xs:group ref="ns1:param-calscale"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:choice>
<xs:element ref="ns1:value-date-and-or-time"/>
<xs:element ref="ns1:text"/>
</xs:choice>
</xs:sequence>
</xs:complexType>
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</xs:element>
<!-- 6.2.7 -->
<xs:element name="gender">
<xs:complexType>
<xs:sequence>
<xs:element ref="ns1:sex"/>
<xs:element ref="ns1:identity" minOccurs="0"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="sex">
<xs:simpleType>
<xs:restriction base="xs:token">
<xs:enumeration value=""/>
<xs:enumeration value="M"/>
<xs:enumeration value="F"/>
<xs:enumeration value="O"/>
<xs:enumeration value="N"/>
<xs:enumeration value="U"/>
</xs:restriction>
</xs:simpleType>
</xs:element>
<xs:element name="identity" type="xs:string"/>
<!-- 6.3.1 -->
<xs:group name="param-label">
<xs:sequence>
<xs:element ref="ns1:label" minOccurs="0"/>
</xs:sequence>
</xs:group>
<xs:element name="label">
<xs:complexType>
<xs:sequence>
<xs:element ref="ns1:text"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="adr">
<xs:complexType>
<xs:sequence>
<xs:element name="parameters" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:group ref="ns1:param-language"/>
<xs:group ref="ns1:param-altid"/>
<xs:group ref="ns1:param-pid"/>
<xs:group ref="ns1:param-pref"/>
<xs:group ref="ns1:param-type"/>
<xs:group ref="ns1:param-geo"/>
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<xs:group ref="ns1:param-tz"/>
<xs:group ref="ns1:param-label"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element ref="ns1:pobox"
minOccurs="0" maxOccurs="unbounded"/>
<xs:element ref="ns1:ext"
minOccurs="0" maxOccurs="unbounded"/>
<xs:element ref="ns1:street"
minOccurs="0" maxOccurs="unbounded"/>
<xs:element ref="ns1:locality"
minOccurs="0" maxOccurs="unbounded"/>
<xs:element ref="ns1:region"
minOccurs="0" maxOccurs="unbounded"/>
<xs:element ref="ns1:code"
minOccurs="0" maxOccurs="unbounded"/>
<xs:element ref="ns1:country"
minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="pobox" type="xs:string"/>
<xs:element name="ext" type="xs:string"/>
<xs:element name="street" type="xs:string"/>
<xs:element name="locality" type="xs:string"/>
<xs:element name="region" type="xs:string"/>
<xs:element name="code" type="xs:string"/>
<xs:element name="country" type="xs:string"/>
<!-- 6.4.1 -->
<xs:element name="tel">
<xs:complexType>
<xs:sequence>
<xs:element name="parameters" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:group ref="ns1:param-altid"
minOccurs="0"/>
<xs:group ref="ns1:param-pid"
minOccurs="0"/>
<xs:group ref="ns1:param-pref"
minOccurs="0"/>
<xs:element name="type" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:element name="text"
type="xs:string"
maxOccurs="unbounded">
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</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:group ref="ns1:param-mediatype"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:choice>
<xs:element ref="ns1:text"/>
<xs:element ref="ns1:uri"/>
</xs:choice>
</xs:sequence>
</xs:complexType>
</xs:element>
<!-- 6.4.2 -->
<xs:element name="email">
<xs:complexType>
<xs:sequence>
<xs:element name="parameters" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:group ref="ns1:param-altid"/>
<xs:group ref="ns1:param-pid"/>
<xs:group ref="ns1:param-pref"/>
<xs:group ref="ns1:param-type"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element ref="ns1:text"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<!-- 6.4.3 -->
<xs:element name="impp">
<xs:complexType>
<xs:sequence>
<xs:element name="parameters" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:group ref="ns1:param-altid"/>
<xs:group ref="ns1:param-pid"/>
<xs:group ref="ns1:param-pref"/>
<xs:group ref="ns1:param-type"/>
<xs:group ref="ns1:param-mediatype"/>
</xs:sequence>
</xs:complexType>
</xs:element>
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<xs:element ref="ns1:uri"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<!-- 6.4.4 -->
<xs:element name="lang">
<xs:complexType>
<xs:sequence>
<xs:element name="parameters" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:group ref="ns1:param-altid"/>
<xs:group ref="ns1:param-pid"/>
<xs:group ref="ns1:param-pref"/>
<xs:group ref="ns1:param-type"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element ref="ns1:language-tag"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<!-- 6.5.1 -->
<xs:group name="property-tz">
<xs:sequence>
<xs:element name="tz">
<xs:complexType>
<xs:sequence>
<xs:element name="parameters" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:group ref="ns1:param-altid"/>
<xs:group ref="ns1:param-pid"/>
<xs:group ref="ns1:param-pref"/>
<xs:group ref="ns1:param-type"/>
<xs:group
ref="ns1:param-mediatype"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:choice>
<xs:element ref="ns1:text"/>
<xs:element ref="ns1:uri"/>
<xs:element ref="ns1:utc-offset"/>
</xs:choice>
</xs:sequence>
</xs:complexType>
</xs:element>
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</xs:sequence>
</xs:group>
<!-- 6.5.2 -->
<xs:group name="property-geo">
<xs:sequence>
<xs:element name="geo">
<xs:complexType>
<xs:sequence>
<xs:element name="parameters" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:group ref="ns1:param-altid"/>
<xs:group ref="ns1:param-pid"/>
<xs:group ref="ns1:param-pref"/>
<xs:group ref="ns1:param-type"/>
<xs:group
ref="ns1:param-mediatype"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element ref="ns1:uri"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:group>
<!-- 6.6.1 -->
<xs:element name="title">
<xs:complexType>
<xs:sequence>
<xs:element name="parameters" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:group ref="ns1:param-language"/>
<xs:group ref="ns1:param-altid"/>
<xs:group ref="ns1:param-pid"/>
<xs:group ref="ns1:param-pref"/>
<xs:group ref="ns1:param-type"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element ref="ns1:text"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<!-- 6.6.2 -->
<xs:element name="role">
<xs:complexType>
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<xs:sequence>
<xs:element name="parameters" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:group ref="ns1:param-language"/>
<xs:group ref="ns1:param-altid"/>
<xs:group ref="ns1:param-pid"/>
<xs:group ref="ns1:param-pref"/>
<xs:group ref="ns1:param-type"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element ref="ns1:text"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<!-- 6.6.3 -->
<xs:element name="logo">
<xs:complexType>
<xs:sequence>
<xs:element name="parameters" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:group ref="ns1:param-language"/>
<xs:group ref="ns1:param-altid"/>
<xs:group ref="ns1:param-pid"/>
<xs:group ref="ns1:param-pref"/>
<xs:group ref="ns1:param-type"/>
<xs:group ref="ns1:param-mediatype"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element ref="ns1:uri"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<!-- 6.6.4 -->
<xs:element name="org">
<xs:complexType>
<xs:sequence>
<xs:element name="parameters" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:group ref="ns1:param-language"/>
<xs:group ref="ns1:param-altid"/>
<xs:group ref="ns1:param-pid"/>
<xs:group ref="ns1:param-pref"/>
<xs:group ref="ns1:param-type"/>
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<xs:group ref="ns1:param-sort-as"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:group ref="ns1:value-text-list"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<!-- 6.6.5 -->
<xs:element name="member">
<xs:complexType>
<xs:sequence>
<xs:element name="parameters" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:group ref="ns1:param-altid"/>
<xs:group ref="ns1:param-pid"/>
<xs:group ref="ns1:param-pref"/>
<xs:group ref="ns1:param-mediatype"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element ref="ns1:uri"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<!-- 6.6.6 -->
<xs:element name="related">
<xs:complexType>
<xs:sequence>
<xs:element name="parameters" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:group ref="ns1:param-altid"/>
<xs:group ref="ns1:param-pid"/>
<xs:group ref="ns1:param-pref"/>
<xs:element name="type" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:element name="text" maxOccurs="unbounded">
<xs:simpleType>
<xs:restriction base="xs:token">
<xs:enumeration value="work"/>
<xs:enumeration value="home"/>
<xs:enumeration value="contact"/>
<xs:enumeration value="acquaintance"/>
<xs:enumeration value="friend"/>
<xs:enumeration value="met"/>
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<xs:enumeration value="co-worker"/>
<xs:enumeration value="colleague"/>
<xs:enumeration value="co-resident"/>
<xs:enumeration value="neighbor"/>
<xs:enumeration value="child"/>
<xs:enumeration value="parent"/>
<xs:enumeration value="sibling"/>
<xs:enumeration value="spouse"/>
<xs:enumeration value="kin"/>
<xs:enumeration value="muse"/>
<xs:enumeration value="crush"/>
<xs:enumeration value="date"/>
<xs:enumeration value="sweetheart"/>
<xs:enumeration value="me"/>
<xs:enumeration value="agent"/>
<xs:enumeration value="emergency"/>
</xs:restriction>
</xs:simpleType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:group ref="ns1:param-mediatype"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:choice>
<xs:element ref="ns1:uri"/>
<xs:element ref="ns1:text"/>
</xs:choice>
</xs:sequence>
</xs:complexType>
</xs:element>
<!-- 6.7.1 -->
<xs:element name="categories">
<xs:complexType>
<xs:sequence>
<xs:element name="parameters" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:group ref="ns1:param-altid"/>
<xs:group ref="ns1:param-pid"/>
<xs:group ref="ns1:param-pref"/>
<xs:group ref="ns1:param-type"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:group ref="ns1:value-text-list"/>
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</xs:sequence>
</xs:complexType>
</xs:element>
<!-- 6.7.2 -->
<xs:element name="note">
<xs:complexType>
<xs:sequence>
<xs:element name="parameters" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:group ref="ns1:param-language"/>
<xs:group ref="ns1:param-altid"/>
<xs:group ref="ns1:param-pid"/>
<xs:group ref="ns1:param-pref"/>
<xs:group ref="ns1:param-type"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element ref="ns1:text"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<!-- 6.7.3 -->
<xs:element name="prodid">
<xs:complexType>
<xs:sequence>
<xs:element ref="ns1:text"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<!-- 6.7.4 -->
<xs:element name="rev" type="ns1:value-timestamp"/>
<!-- 6.7.5 -->
<xs:element name="sound">
<xs:complexType>
<xs:sequence>
<xs:element name="parameters" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:group ref="ns1:param-language"/>
<xs:group ref="ns1:param-altid"/>
<xs:group ref="ns1:param-pid"/>
<xs:group ref="ns1:param-pref"/>
<xs:group ref="ns1:param-type"/>
<xs:group ref="ns1:param-mediatype"/>
</xs:sequence>
</xs:complexType>
</xs:element>
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<xs:element ref="ns1:uri"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<!-- 6.7.6 -->
<xs:element name="uid">
<xs:complexType>
<xs:sequence>
<xs:element ref="ns1:uri"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<!-- 6.7.7 -->
<xs:element name="clientpidmap">
<xs:complexType>
<xs:sequence>
<xs:element ref="ns1:sourceid"/>
<xs:element ref="ns1:uri"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="sourceid" type="xs:positiveInteger"/>
<!-- 6.7.8 -->
<xs:element name="url">
<xs:complexType>
<xs:sequence>
<xs:element name="parameters" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:group ref="ns1:param-altid"/>
<xs:group ref="ns1:param-pid"/>
<xs:group ref="ns1:param-pref"/>
<xs:group ref="ns1:param-type"/>
<xs:group ref="ns1:param-mediatype"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element ref="ns1:uri"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<!-- 6.8.1 -->
<xs:element name="key">
<xs:complexType>
<xs:sequence>
<xs:element name="parameters" minOccurs="0">
<xs:complexType>
<xs:sequence>
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<xs:group ref="ns1:param-altid"/>
<xs:group ref="ns1:param-pid"/>
<xs:group ref="ns1:param-pref"/>
<xs:group ref="ns1:param-type"/>
<xs:group ref="ns1:param-mediatype"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:choice>
<xs:element ref="ns1:uri"/>
<xs:element ref="ns1:text"/>
</xs:choice>
</xs:sequence>
</xs:complexType>
</xs:element>
<!-- 6.9.1 -->
<xs:element name="fburl">
<xs:complexType>
<xs:sequence>
<xs:element name="parameters" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:group ref="ns1:param-altid"/>
<xs:group ref="ns1:param-pid"/>
<xs:group ref="ns1:param-pref"/>
<xs:group ref="ns1:param-type"/>
<xs:group ref="ns1:param-mediatype"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element ref="ns1:uri"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<!-- 6.9.2 -->
<xs:element name="caladruri">
<xs:complexType>
<xs:sequence>
<xs:element name="parameters" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:group ref="ns1:param-altid"/>
<xs:group ref="ns1:param-pid"/>
<xs:group ref="ns1:param-pref"/>
<xs:group ref="ns1:param-type"/>
<xs:group ref="ns1:param-mediatype"/>
</xs:sequence>
</xs:complexType>
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</xs:element>
<xs:element ref="ns1:uri"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<!-- 6.9.3 -->
<xs:element name="caluri">
<xs:complexType>
<xs:sequence>
<xs:element name="parameters" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:group ref="ns1:param-altid"/>
<xs:group ref="ns1:param-pid"/>
<xs:group ref="ns1:param-pref"/>
<xs:group ref="ns1:param-type"/>
<xs:group ref="ns1:param-mediatype"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element ref="ns1:uri"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<!-- Top-level grammar -->
<xs:group name="property">
<xs:sequence>
<xs:element ref="ns1:adr" minOccurs="0"
maxOccurs="unbounded"/>
<xs:element ref="ns1:anniversary" minOccurs="0"
maxOccurs="1"/>
<xs:element ref="ns1:bday" minOccurs="0"
maxOccurs="1"/>
<xs:element ref="ns1:caladruri" minOccurs="0"
maxOccurs="unbounded"/>
<xs:element ref="ns1:caluri" minOccurs="0"
maxOccurs="unbounded"/>
<xs:element ref="ns1:categories" minOccurs="0"
maxOccurs="unbounded"/>
<xs:element ref="ns1:clientpidmap" minOccurs="0"
maxOccurs="unbounded"/>
<xs:element ref="ns1:email" minOccurs="0"
maxOccurs="unbounded"/>
<xs:element ref="ns1:fburl" minOccurs="0"
maxOccurs="unbounded"/>
<xs:element ref="ns1:fn" minOccurs="1"
maxOccurs="unbounded"/>
<xs:group ref="ns1:property-geo" minOccurs="0"
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maxOccurs="unbounded"/>
<xs:element ref="ns1:impp" minOccurs="0"
maxOccurs="unbounded"/>
<xs:element ref="ns1:key" minOccurs="0"
maxOccurs="unbounded"/>
<xs:element ref="ns1:kind" minOccurs="0"
maxOccurs="1"/>
<xs:element ref="ns1:lang" minOccurs="0"
maxOccurs="unbounded"/>
<xs:element ref="ns1:logo" minOccurs="0"
maxOccurs="unbounded"/>
<xs:element ref="ns1:member" minOccurs="0"
maxOccurs="unbounded"/>
<xs:element ref="ns1:n" minOccurs="0"
maxOccurs="1"/>
<xs:element ref="ns1:nickname" minOccurs="0"
maxOccurs="unbounded"/>
<xs:element ref="ns1:note" minOccurs="0"
maxOccurs="unbounded"/>
<xs:element ref="ns1:org" minOccurs="0"
maxOccurs="unbounded"/>
<xs:element ref="ns1:photo" minOccurs="0"
maxOccurs="unbounded"/>
<xs:element ref="ns1:prodid" minOccurs="0"
maxOccurs="1"/>
<xs:element ref="ns1:related" minOccurs="0"
maxOccurs="unbounded"/>
<xs:element ref="ns1:rev" minOccurs="0"
maxOccurs="1"/>
<xs:element ref="ns1:role" minOccurs="0"
maxOccurs="unbounded"/>
<xs:element ref="ns1:gender" minOccurs="0"
maxOccurs="1"/>
<xs:element ref="ns1:sound" minOccurs="0"
maxOccurs="unbounded"/>
<xs:element ref="ns1:source" minOccurs="0"
maxOccurs="unbounded"/>
<xs:element ref="ns1:tel" minOccurs="0"
maxOccurs="unbounded"/>
<xs:element ref="ns1:title" minOccurs="0"
maxOccurs="unbounded"/>
<xs:group ref="ns1:property-tz" minOccurs="0"
maxOccurs="unbounded"/>
<xs:element ref="ns1:uid" minOccurs="0"
maxOccurs="1"/>
<xs:element ref="ns1:url" minOccurs="0"
maxOccurs="unbounded"/>
</xs:sequence>
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</xs:group>
<xs:element name="vcards">
<xs:complexType>
<xs:sequence>
<xs:element ref="ns1:vcard" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:complexType name="vcardType">
<xs:sequence>
<xs:group ref="ns1:property"/>
<xs:element ref="ns1:group" minOccurs="0"
maxOccurs="unbounded"/>
<xs:any namespace="##other" processContents="lax"
minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<xs:element name="vcard" type="ns1:vcardType"/>
<xs:element name="group">
<xs:complexType>
<xs:group ref="ns1:property"/>
<xs:attribute name="name" use="required"/>
</xs:complexType>
</xs:element>
</xs:schema>
Appendix B. XML Validation
This document defines a number of XML schemas and contains various
examples. Extracting the XML and validating the examples against the
schemas can be challenging, especially due to the formatting
limitations introduced by IETF RFCs. For those readers who copy the
XML schemas and examples directly from this document, please consider
that errors might be introduced due to line breaks and extra
whitespaces in the regular expressions contained in the vCard schema
in Appendix A. To validate the PIDF-LO from Figure 18, it is also
necessary to consult the referenced RFCs and copy the schemas
necessary for successful validation.
The XML schemas found in this document include a 'SchemaLocation'
attribute. Depending on the location of the downloaded schema files,
you may need to adjust this schema location or configure your XML
editor to point to the location.
For the convenience of the reader, the schemas are available at
[IANA-XML-Schemas], and the XML examples are available at the IETF
ECRIT working group wiki page [ECRIT-WG-wiki].
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Acknowledgments
This work was originally started in NENA and has benefited from a
large number of participants involved in NENA standardization
efforts, originally in the Long Term Definition working group, the
Data Technical Committee, and most recently in the Additional Data
working group. The authors are grateful for the initial work and
extended comments provided by many NENA participants, including
Delaine Arnold, Marc Berryman, Guy Caron, Brian Dupras, Mark
Fletcher, James Leyerle, Kathy McMahon, Christian Militeau, Ira
Pyles, Matt Serra, and Robert (Bob) Sherry. Amursana Khiyod, Robert
Sherry, Frank Rahoi, Scott Ross, and Tom Klepetka provided valuable
feedback regarding the vCard/xCard use in this specification.
We would also like to thank Paul Kyzivat, Gunnar Hellstrom, Martin
Thomson, Keith Drage, Laura Liess, Chris Santer, Barbara Stark, Chris
Santer, Archie Cobbs, Magnus Nystrom, Stephen Farrell, Amanda Baber,
Dan Banks, Andrew Newton, Philip Reichl, and Francis Dupont for their
review comments. Alissa Cooper, Guy Caron, Ben Campbell, and Barry
Leiba deserve special mention for their detailed and extensive review
comments, which were very helpful and appreciated.
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Authors' Addresses
Randall Gellens
San Diego, CA 92121
United States
Email: rg+ietf@randy.pensive.org
Brian Rosen
NeuStar
470 Conrad Dr.
Mars, PA 16046
United States
Phone: +1 724 382 1051
Email: br@brianrosen.net
Hannes Tschofenig
Hall in Tirol 6060
Austria
Email: Hannes.tschofenig@gmx.net
URI: http://www.tschofenig.priv.at
Roger Marshall
TeleCommunication Systems, Inc.
2401 Elliott Avenue
Seattle, WA 98121
United States
Phone: +1 206 792 2424
Email: rmarshall@telecomsys.com
URI: http://www.telecomsys.com
James Winterbottom
Winterb Consulting Services
Gwynneville, NSW 2500
Australia
Phone: +61 448 266004
Email: a.james.winterbottom@gmail.com
Gellens, et al. Standards Track [Page 113]