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Overview
V.22 handshake
V.22
bis
V.32 handshake
V.34 handshake
Wireline DAA
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Telephone line signalling
Descriptive information about the various signals from/to the PSTN
Tones from PSTN
Busy tone
Call waiting tone
Caller waiting tone
Comfort tone
Conference tone
Confirmation tone
Congestion tone
Dial tone
Disconnect tone
End of three party service tone
Executive override tone
Holding tone
Howler tone
Intrusion tone
Line lock-out tone
Negative indication tone
Notify tone
Number unobtainable tone
Off-hook warning tone
Pay tone
Payphone recognition tone
Preemption tone
Queue tone
Recall dial tone
Record tone
Ringing tone
Search tone
Second dial tone
Special dial tone
Special information tone
Waiting tone
Warning tone
Signals to PSTN
Answer tone
Calling tone
Guard tone
Pulse (loop disconnect) dialling
Tone (DTMF) dialling
Other signals from PSTN
Billing (metering) signal
DC conditions
Ringing signal
Even more tones from PSTN
>>> Show/hide
Acceptance tone
Audible ring tone
Busy override warning tone
Busy verification tone
Engaged tone
Facilities tone
Fast busy tone
Function acknowledge tone
Identification tone
Intercept tone
Permanent signal tone
Positive indication tone
Re-order tone
Refusal tone
Ringback tone
Route tone
Service activated tone
SIT
Special ringing tone
Stutter dial tone
Switching tone
Test number tone
Test tone
Trunk offering tone
ITU-T annex to E.180 (obsolete)
List of tones used in national networks
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World PSTN tone database
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