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- ==Phrack Inc.==
- Volume One, Issue Three, Phile #4 of 10
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- Signalling Systems Around the World
-
-
- For those of you who have the desire to make international calls, this info
- may be of interest. Thanks to TAP and Nick Haflinger.
-
- CCITT #1. An old international system, now deceased. Used a 500 Hz tone
- interrupted at 20 Hz (Ring) for 1-way line signals.
-
- CCITT #2. Proposed "International Standard" that never caught on much.
- Used 600 Hz interrupted by 750 Hz. Still used in Australia,
- New Zealand and South Africa.
-
- CCITT #3. An early in-band system that uses 2280 for both line and
- register (!!). Used in France, Austria, Poland and Hungary.
-
- CCITT #4 A variation of #3, but uses 2040 and 2400 for end to end Tx of
- line and register. Used for international Traffic in Europe,
- but cannot be used with TASI (AKA Multiplex or "that dammed
- clipping").
-
- CCITT #5 This is the most popular, and the one used in the US. 2400 and
- the infamous 2600 are used for link to link (not merely end to
- end line signals. Registers are handled via DTMF (Touchtones).
- Anyone know what 2400 does??
-
- CCITT #5 bis. Just like above, but a 1850 Hz tone is used for TASI locking
- and transmission of line signals.
-
- CCITT #6 The newest and worst for phreaks. It uses digital data sent
- out-of-band to control the connection. In other words, the
- connection is made and billing started BEFORE you can get
- control.
-
- CCITT #5R1 A regional system like 5, but doesn't use the mysterious 2400
- and can't use the multiplexer.
-
- CCITT #5R2 Probably the interface to AUTOVON, as it uses 120 Hz spaced
- tones for DTMF instead of 200. Also 3825 Hz is the blow-off
- tone instead of 2600.
-
-
- The "Extra" tones
-
- 1700 + 700 = Inward Operator
- 1700 + 900 = Delay operator, also, in TSPS,STP (a "Zero Plus" call from a coin
- phone)
- 1700 + 1100= KP1 (Start recognition of special tones)
- 1300 + 1700= KP2 (End recognition of special tones)
-
- 12-85 Data Line. CIS 72767,3207: TWX 650-240-6356
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