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[12] [10] As dozens of callers attempted to reach the DJ or talk show host at the same time, many would invariably reach a busy signal, through which they could speak to other shunted callers. [10] [14] [8]: 3–2 Another entry point was permanently unavailable numbers or loop-around test numbers intended for internal use by the telephone company.
In some instances the Number Unobtainable Tone may be used instead. This is a continuous, uninterrupted 400 Hz tone. The signal is used to indicate that the destination is unreachable, either because all circuits (trunks) are busy, the called number is out of service, the call is unroutable, or sometimes that an invalid code has been dialed. [1]
An otherwise unspecified busy signal indicates that the called number is occupied: The called number is talking with another caller on the phone; The number is calling out; Someone else has called the number or is calling the number at the same time; The other line was left off-hook; It is otherwise unavailable
In many cases, when calling from abroad, busy, reorder and other call failure tones may be played by the local switch. Modern signalling protocols like SS7 send this information digitally; thus only a ringback tone or announcement generated by a distant switch in a foreign network will ever be heard by callers from other countries or networks.
The signal may be implemented by removal of battery on the circuit (open switching interval) or by polarity reversal of the tip and ring conductors of the telephone line. An analogue telephone line may also send tones, such as a busy signal , reorder tone , or dial tone , to indicate a call has ended.
Reproduction of an iOS phone disconnect tone (not the original audio) A disconnect tone in telephony is a tone provided to the remaining party to a call after the remote party hangs up. [ 1 ] [ 2 ] Typically, the disconnect tone is a few cycles of the reorder , busy , or the off-hook tone (e.g. in US), or between five and fifteen seconds of the ...
When is the best time to visit a Pennsylvania Driver's License or Photo License Center?. The Pennsylvania Department of Transportation just let the word out: Between 8:15 and 9 a.m. on Wednesdays ...
Like a dial tone or busy signal, the SIT is an in-band signal intended both to be heard by the caller, and to be detected by automated dialing equipment to determine a call has failed. In North America, the AT&T/Bellcore SIT standard allows the frequency and duration of the tones to vary slightly - making eight distinct messages specifically ...