Call-progress tone

Call-progress tone

In telephony, call progress tones are audible tones sent from the PSTN or a PBX to calling parties to indicate the status of phone calls.

Equipment such as fax machines and modems are designed to recognise dial tones and busy tones.

The ITU-T E.180 and E.182 recommendations define the technical characteristics and intended usage of some of these tones.

Types

Major ones encountered by the public on a regular basis are listed in bold:
*busy tone or busy signal
*call waiting tone
*comfort tone
*conference call tone
*confirmation tone
*congestion tone
*dial tone
*end of three-party service tone (three-way calling)
*executive override tone
*holding tone
*howler tone
*intercept tone
*intrusion tone
*line lock-out tone
*negative indication tone
*notify tone
*number unobtainable tone
*pay tone
*payphone recognition tone
*permanent signal tone
*preemption tone
*queue tone
*recall dial tone
*record tone
*ringback tone or ringing tone
*ringtone or ringing signal
*second dial tone
*special dial tone
*special information tone (SIT)
*waiting tone
*warning tone

External links

* [http://www.3amsystems.com/wireline/tls.htm Telephone line signalling]
* [http://www.3amsystems.com/wireline/tone-search.htm World PSTN Tone Database]
* [http://www.itu.int/ITU-T/inr/forms/files/tones-0203.pdf VARIOUS TONES USED IN NATIONAL NETWORKS (ACCORDING TO ITU-T RECOMMENDATION E.180)]


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