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Busy line interrupt. Busy line interrupt, also known as emergency breakthrough, is a function of telephone land line carriers in which a telephone operator, by request of a caller, interrupts an existing phone conversation between other parties. [1] This is especially useful for services without call waiting . Much like long distance calling ...
See media help. The reorder tone, also known as the fast busy tone, or the congestion tone, or all trunks busy ( ATB) tone is an audible call progress tone in the public switched telephone network (PSTN) that is returned to a calling party to indicate that the call cannot be processed through the network. [1]
Call again, a form of automatic ring back, allows a caller, on reaching a busy signal, to hang up, dial a special code, and be called back automatically when the called number is no longer busy, usually with a limit of 30 minutes. Call return allows a customer to dial a code that identifies the last incoming call. On some types of central ...
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 ...
Continuous redial, busy number redial, or repeat dial is a vertical service code (calling feature) that allows callers to automatically redial a busy telephone number until a connection is made. It was introduced in 1992 as Repeat Dialing, [1] and is activated by dialing a combination of special characters and numbers after hanging up following ...
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Call forwarding. Call forwarding, or call diversion, is a telephony feature of all telephone switching systems which redirects a telephone call to another destination, which may be, for example, a mobile or another telephone number where the desired called party is available. Call forwarding was invented by Ernest J. Bonanno.
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 ...