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In telephony, call progress tones are audible tones that provide an indication of the status of a telephone call to the user. The tones are generated by a central office or a private branch exchange (PBX) to the calling party . Telecommunication equipment such as fax machines and modems are designed to recognize certain tones, such as dial tone ...
Ringing tone ( audible ringing, also ringback tone) is a signaling tone in telecommunication that is heard by the originator of a telephone call while the destination terminal is alerting the receiving party. The tone is typically a repeated cadence similar to a traditional power ringing signal ( ringtone ), but is usually not played synchronously.
Precise tone plan. The precise tone plan is a signaling specification for the public switched telephone network (PSTN) in North America. It defines the call-progress tones used for indicating the status and progress of telephone calls to subscribers and operators. All signals in the specification use combination (by addition) of audible tones ...
Ringtone. Ringing noise from an electromechanical telephone. Example of a short digital tune which could be used as a ringtone on a mobile phone. A ringtone is the sound made by a telephone to indicate an incoming telephone call. Originally referring to the sound of electromechanical striking of bells or gongs, the term refers to any sound by ...
Plain old telephone service. Plain Old Telephone Service ( POTS ), or Plain Ordinary Telephone System, [ 1] is a retronym for voice-grade telephone service employing analog signal transmission over copper loops. Originally POTS stood for Post Office Telephone Service as early phone lines in most parts of the world were operated directly by the ...
ToneScript. ToneScript is a description syntax for the characteristics of call-progress tones . A call progress tone is a pattern of audible tones played to the caller in a telephone call, conveying the status of the call. ToneScript describes the pattern of frequency, cadence, and level of the signal.
Ringback number. A ringback number is a telephone number for a telephone line that automatically calls the line that the call was placed from, after the caller has hung up. The typical use of this facility is by telephone company technicians for testing a new installation or for trouble-shooting. [ 1]
A busy signal (or busy tone or engaged tone) in telephony is an audible call-progress tone or audible signal to the calling party that indicates failure to complete the requested connection of that particular telephone call . The busy signal has become less common in the past few decades due to the prevalence of call waiting and voicemail .