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Telecommunication equipment such as fax machines and modems are designed to recognize certain tones, such as dial tone and busy tone. The ITU-T E.180 and E.182 recommendations define the technical characteristics and intended usage of some of these tones. ToneScript is a tone description format that may be used to specify the tone.
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.
In fax and voice data modes, sometimes events occur that the modem wishes to signal to the computer regardless of whether it's in command or data mode. An example of such an event is a caller pressing a touch-tone key in voice mode. Other common out-of-band messages are notifications from the modem that data was lost because the computer is ...
People will always keep upgrading technology with latest versions. Current time is the time of emailing and electronic messages. But there are few technologies which refuse to die and Fax machine ...
A list of Hayes AT commands Archived 2008-07-10 at the Wayback Machine; 3gpp.org, 3GPP AT command set for User Equipment; Modem initialisation string Archived 2009-03-10 at the Wayback Machine; Extended Hayes AT command parameters for SMS (dead) Determining your Class of Fax / Modem; Openmoko: AT Commands
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 ...
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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 ...