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An automatic number announcement circuit ( ANAC) is a component of a central office of a telephone company that provides a service to installation and service technicians to determine the telephone number of a telephone line. The facility has a telephone number that may be called to listen to an automatic announcement that includes the caller's ...
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]
Automatic callback. In telecommunication, an automatic callback is a computer telephony calling feature that permits a user, when encountering a busy condition or other condition where the called individual is unavailable, to instruct the system to retain the called number and to establish the call when there is an available line or when the ...
Bell System tones. In North America (excluding Mexico, Central America and parts of the Caribbean ), the standard audible ringing tone is a repeated cadence of a two-second tone and four seconds of silence. In Korea, repeated cadence of a one-second tone and two seconds of silence. The signal is composed of the frequencies 440 Hz and 480 Hz.
Automatic ring back is a service offered by phone companies . On making a telephone call to a number that is engaged, automatic ring back is a service provided by the telephone company whereby, when the called number becomes available, the caller is rung back, usually with a distinctive "ring back" ring. When the phone is picked up, it calls ...
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 ...
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 of four frequencies ...
Special information tone. 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. [1] [2]
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