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File : PHONEFREQ.TXT
Author : Iceman
BBS : The Banana Republic BBS
10/04/89 The Good Oil on NZ (CCITT) Phone Tones
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These are *not* touch-tone tones; they are used by Telecom *internally*
for signalling between exchanges. They used to be used to get pulse dial to
work long-distance, viz:
Pulse +----------+ Tones +----------+ To rec.
dial ----->| Exchange |--------------------->| Exchange |----> phone.
+----------+ +----------+
Frequencies are:
Digit: Hz: -> CCITT Numerical code.
======================
1 700 + 900
2 700 + 1100
3 900 + 1100
4 700 + 1300
5 900 + 1300
6 1100 + 1300
7 700 + 1500
8 900 + 1500
9 1100 + 1500
0 1300 + 1500
Code 11 700 + 1700 \ For inward
Code 12 900 + 1700 / operators
KP 1100 + 1700 Prime (Start of pulsing)
KP2 1300 + 1700 Transit Traffic (?)
ST 1500 + 1700 Start (End of pulsing)
These are (supposedly) used for international && trunkline signalling.
This is how operator-assisted long-distance calls work:
- Call operator pulse dial.
- Operator hits [KP] (signals start of dialling)
dials wanted number
hits [ST] (ringing occurs)
NB: The connection is made once the number is dialed, but ringing does
not occur until [ST] is hit.
This is how the guy in Wellington reckons you call long-dist:
- Call an 0800 number.
- Hit [KP]
- Dial wanted number.
- Hit [ST]
To Telecom it looks as though the call goes to the free number.
Notes: - This will only work with calls to other exchangesas it uses the
CCITT frequencies.
- It should be possible to make a cheap exchange-to-exchange call,
eg Auckland to HBC, then dial out to wherever.
- You can also do this with subscribers (ie the Auckland ->Hamilton
mentioned above). The only thing is that the 'intermediates'
phone will be dead while you are abusing it, but if you call a
business no. at night it's OK. It will just look like a long
call to a business in Hamilton at 34c/minute.
- Don't do this to ordinary people - get businesses/govt agencies
etc, people that can afford to pay (like stockbrokers etc).
Source for tech. details:
The Telecom Library in Wellington.
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AUTHOR: Iceman
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