"Tone dialing" redirects here. For the Ornette Coleman album, see Tone Dialing (album).
For the video game, see TouchTone.
Autovon keypads were one of the few production units to include all 16 DTMF signals. The red keys in the fourth column produce the A, B, C, and D DTMF events.
Dual-tone multi-frequency signaling (DTMF) is a telecommunication signaling system using the voice-frequency band over telephone lines between telephone equipment and other communications devices and switching centers.[1] DTMF was first developed in the Bell System in the United States, and became known under the trademark Touch-Tone for use in push-button telephones supplied to telephone customers, starting in 1963. DTMF is standardized as ITU-T Recommendation Q.23.[2] It is also known in the UK as MF4.
Touch-Tone dialing with a telephone keypad gradually replaced the use of rotary dials and has become the industry standard in telephony. Other multi-frequency systems are also used for signaling on trunks in the telephone network.
^Z., Dodd, Annabel (2012). The essential guide to telecommunications (5th ed.). Upper Saddle River, NJ: Prentice Hall. ISBN 9780137058914. OCLC 779863446.{{cite book}}: CS1 maint: multiple names: authors list (link)
^Technical features of push-button telephone sets (Report). Recommendation. ITU. Q.23.
Dual-tone multi-frequency signaling (DTMF) is a telecommunication signaling system using the voice-frequency band over telephone lines between telephone...
number. It was standardized when the dual-tone multi-frequency signaling (DTMF) system was developed in the Bell System in the United States in the 1960s...
interact with a computer-operated telephone system through the use of voice and DTMF tones input with a keypad. In telephony, IVR allows customers to interact...
Selective calling systems can overlap; a radio may have (group call) and DTMF individual calling. Selective calling prevents the user from hearing others...
radio operators (hams) within radio range of a local node are able to use DTMF tone generators to initiate a node-to-node connection with any other available...
systems are Dual Tone Multiple Frequency (DTMF), and Continuous Tone Coded Squelch System (CTCSS). A DTMF selective signaling PMRS system uses a code...
dual-tone, a short ring "pulse", or a line reversal followed by a dual-tone). A DTMF signalling using the 16 standard dialing tones. EN 300 659-2 expands the...
to the public at the 1962 World's Fair under the trade name Touch-Tone (DTMF). Touch-tone technology primarily used a keypad in the form of a rectangular...
accepted DTMF "touch tones" or other tone signaling systems. A transitional technology (from pulse to DTMF) had converters to convert DTMF to pulse,...
applications, such as recognition of dual-tone multi-frequency signaling (DTMF) tones produced by the push buttons of the keypad of a traditional analog...
TelstraClear/Vodafone) 1958 - sends back the number the user is calling from in DTMF tones. (not TelstraClear/Vodafone) 511 - reads back the number the user is...
requires implementations to provide PCMA/PCMU (RFC 3551), Telephone Event as DTMF (RFC 4733), and Opus (RFC 6716) audio codecs as minimum capabilities. The...
is accessed while Sentralok requires a dispatcher to release the key with DTMF tones. Both Sentralok and KeySecure are also branded products of the Knox...
calls manually, as well as machine to machine dialing, and predates the DTMF Touch-Tone system used by subscribers. The leading 1 for customer dialed...
telephones, if wired to a modern DTMF capable exchange, can also be exploited by a tone dialer that generates the DTMF tones used by modern keypad units...
A silver box is a modified DTMF keypad that adds four additional keys. This gives four columns of four keys each (16 total) instead of three columns (in...
bases. The sirens can be activated by radio using single tone, two-tone, DTMF, MSK or POCSAG over analog, digital and trunking systems, or by satellite...
information that does not modify the session state. This method is often used for DTMF relay. RFC 6086 OPTIONS Query the capabilities of an endpoint. It is often...
transmissions should begin with the LITZ (Long Interval Tone Zero or Long Time Zero) DTMF signal for at least 5 seconds. CQ like calls (to see who is out there) should...
depends on their phone system — generally it is either in-band-signaling DTMF sequence such as the *57 Vertical service code or a special button attached...
telephone exchange designs, the line cards generate ringing current and decode DTMF signals. The line card in a subscriber loop carrier is called a subscriber...
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