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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.
This service is known in America as Number Referral Service, and in Britain as Ceased Number Intercept. An example of a Number Referral Service intercept message is: The number you have reached [NUMBER] has been changed the new number is [NEW NUMBER] please make a note of the change.
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 ...
However, if you get a call from a phone number or area code you don’t know, it’s likely best to avoid picking up the call and research the following before you call back:
Before modern electronic telephone switching systems came into use, dial tones were usually generated by electromechanical devices such as motor-generators or vibrators. In the United States, the standard "city" dial tone was a 600 Hz tone that was amplitude-modulated at 120 Hz. [3] Some dial tones were simply adapted from 60 Hz AC line current.
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A reorder tone, sometimes called a fast busy signal, indicates that no transmission path to the called number is available. This can occur either because the Inter-LATA trunk is busy at the time of the call- in which case this clears in a few seconds, if one redials- or the number is temporarily out of service, due to maintenance or the number ...