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The number of rings before answering is not guaranteed, and may vary to some extent. This can be a problem if an answering machine is used on a line with a 1571 service (which cannot be temporarily disabled), with the intention that messages will be recorded on the machine; it is necessary to ensure that the machine answers before 1571 does.
In GSM networks of some US carriers, and in all mobile networks in Europe, it is possible to set a number of seconds for the phone to ring before forwarding the call. This is specified by inserting " *SC*XX " prior to the final "#" of the forwarding command, where " SC " is a service type code (11 for voice , 25 for data , 13 for fax ), and ...
Many customer-owned coin-operated telephones (COCOT) answer the phone at first ring with a built in modem which can be accessed by technicians to report conditions and program function parameters, one programmable function is the number of rings until the modem answers, another is whether to impose an additional charge for incoming calls or ...
Pre-answer tones Frequency definition Tone cadence Dial tone A: 425 Hz: continuous Dial tone B: 425 Hz, amplitude modulated by 25 Hz: continuous Dial tone C: 400 Hz + 425 Hz + 450 Hz: continuous Dial tone D: 400 Hz + 425 Hz: continuous Dial tone E: 413 Hz + 438 Hz: continuous Ringback tone A: 425 Hz, amplitude modulated by 25 Hz: 0.4 s on, 0.2 ...
In many cases, the cadence consists of a double ring of 0.4 seconds separated by 0.2 seconds, and a two second pause after which the cadence repeats (0.4s on, 0.2 s off, 0.4 s on, 2 s off). In many cases the tone is a combination of 400 Hz and 450 Hz sine waves.
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A Panasonic answering machine with a dual compact cassette tape drive to record and replay messages. An answering machine, answerphone, or message machine, also known as telephone messaging machine (or TAM) in the UK and some Commonwealth countries, ansaphone or ansafone (from a trade name), or telephone answering device (TAD), is used for answering telephone calls and recording callers' messages.