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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.
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 ...
A message may also be played when 0 or 1 followed by an area code is prepended unnecessarily on landline phone calls to local destinations. As of 2021, area code dialing is required in multi area code areas even for local calls, making the "not necessary to dial a 1 or 0" message no longer relevant for some areas.
The formula provides the GoS (grade of service) which is the probability P b that a new call arriving to the resources group is rejected because all resources (servers, lines, circuits) are busy: B(E, m) where E is the total offered traffic in erlang, offered to m identical parallel resources (servers, communication channels, traffic lanes).
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.
2. Confirm the proper code is listed. For most telephone services, this code is *70. Note: If your connection problems persist, try removing the checkmark for call waiting. Dialing *70 can prevent the call from completing when the phone line does not have the call waiting feature active. Leave this option unchecked if you are no longer able to ...
Low tone, also busy tone, is defined as having frequency components of 480 and 620 Hz at a level of −24 dBm and a cadence of one half second ON and one half second OFF. Reorder tone, also often called fast busy tone, is the same tone, but with a cadence of 0.25 of a second ON and 0.25 of a second OFF. The original plan had two slightly ...
For example, you might get a text message or email with a six-digit code that you must enter when you log into your bank account. This extra level of protection keeps scammers and hackers out.