A disconnect tone in telephony is a tone provided to the remaining party to a call after the remote party hangs up.
Telecommunications: Glossary of Telecommunications Terms
'. Government Institutes, 1997. D-23. Typically, the disconnect tone is a few cycles of the
reorder,
busy, or the off-hook tone (e.g. in US), or between five and fifteen seconds of the Number Unobtainable tone (e.g. in UK).
On some telephone exchanges in the UK, the following audio message is looped for fifteen seconds, interspersed with
special information tones
In telephony, a special information tone (SIT) is an in-band international standard call progress tone consisting of three rising tones indicating a call has failed. It usually precedes a recorded announcement describing the problem.BOC Notes on ...
(SIT), to advise the remote party has hung up: "(SIT) The other person has hung up". On
iPhone
The iPhone is a line of smartphones developed and marketed by Apple that run iOS, the company's own mobile operating system. The first-generation iPhone was announced by then–Apple CEO and co-founder Steve Jobs on January 9, 2007, at ...
s, the tone is 3 bursts of 425 Hz tones each lasting 0.2 seconds.
See also
*
Forward disconnect
References
{{DEFAULTSORT:Disconnect Tone
Telephony signals