Dual-tone multi-frequency signaling (DTMF) is a telecommunication signaling system using the voice-frequency band over telephone lines between telephone...
19 KB (2,146 words) - 20:50, 17 October 2024
DTMF signals are transmitted in-band by two methods. When transmitted as audio tones in the voice stream, voice encoding must use a lossless coder, such...
9 KB (1,196 words) - 19:25, 4 September 2024
Push-button telephone (section DTMF keypad layout)
System in the United States officially introduced dual-tone multi-frequency (DTMF) technology under its registered trademark Touch-Tone.[citation needed] Over...
25 KB (2,767 words) - 04:19, 14 October 2024
083201231 - reads back the pilot number as above, with area code. 083201232 - returns the DTMF tones of the line called from. 137 - ringer test (ringback...
34 KB (1,745 words) - 08:03, 4 October 2024
system – generally it is either in-band-signaling DTMF sequence such as the *57 Vertical service code or a special button attached to their phone generating...
3 KB (372 words) - 01:52, 16 September 2024
Professional mobile radio (section DTMF)
Multiple Frequency (DTMF), and Continuous Tone Coded Squelch System (CTCSS). A DTMF selective signaling PMRS system uses a code sequence of discrete...
18 KB (2,774 words) - 20:56, 27 March 2024
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 –...
16 KB (1,624 words) - 22:57, 16 August 2024
Selective calling (section DTMF)
in this case a specific digital code. Selective calling systems can overlap; e.g. a radio may have CTCSS and DTMF calling. Selective calling prevents...
26 KB (4,028 words) - 10:06, 30 July 2024
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...
27 KB (3,511 words) - 14:49, 4 June 2024
Dial peer Dial tone Distribution frame Dual-tone multi-frequency signaling (DTMF) Emergency telephone number End instrument Engset calculation Erlang unit...
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The calling sequence can contain dialable numbers such as digits 0–9 and DTMF tones ABCD*#, formatting characters ␣ . -, and control characters ! P T ...
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(MDCT) coding. Dual-tone multi-frequency signaling (DTMF), fax transmissions, and high-quality audio cannot be transported reliably with this codec. DTMF requires...
16 KB (1,542 words) - 21:37, 25 April 2024
Tip and ring (section Color code)
When Touch-Tone service was introduced in the 1960s, the tone generator for DTMF required correct polarity as it depended on the line D.C. voltage for operation...
6 KB (854 words) - 19:33, 7 September 2024
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...
52 KB (5,731 words) - 19:19, 17 October 2024
accepted DTMF "touch tones" or other tone signaling systems. A transitional technology (from pulse to DTMF) had converters to convert DTMF to pulse,...
45 KB (5,970 words) - 19:35, 22 September 2024
callers' voice) is using. An example is dual-tone multi-frequency signaling (DTMF), which is used on most telephone lines to customer premises. Out-of-band...
7 KB (863 words) - 23:59, 15 September 2024
the user's communication channel. Symbols in the DTMF and MF alphabets are sent as tone pairs; DTMF selects one tone from a "high" group and one from...
16 KB (2,090 words) - 19:32, 23 August 2024
Blue box (section Special codes)
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...
46 KB (6,593 words) - 23:23, 20 September 2024
audio payload formats are G.711, G.723, G.726, G.729, GSM, QCELP, MP3, and DTMF, and examples of video payloads are H.261, H.263, H.264, H.265 and MPEG-1/MPEG-2...
20 KB (2,285 words) - 22:22, 5 September 2024
Pulse dialing (section Pulse rate and coding)
1963, the Bell System introduced to the public dual-tone multi-frequency (DTMF) technology under the name Touch-Tone, which was a trademark in the U.S....
9 KB (1,293 words) - 20:30, 4 September 2024
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...
35 KB (4,420 words) - 04:57, 17 October 2024
& Single Data Message Format (SDMF), plus the Dual-tone multi-frequency (DTMF) system and a no-ring mode for meter-reading and the like. It's more of a...
16 KB (1,908 words) - 03:39, 31 July 2024
Premium-rate telephone number (redirect from 900 area code)
children to hold a landline telephone up to the television set while the DTMF tones of the number were played. This type of scam was especially popular...
30 KB (3,705 words) - 18:37, 22 September 2024
pairs, this signaling format is sometimes referred to as "two-out-of-five code" or "two of six." Multi-Frequency receivers have been present in US telephony...
1 KB (164 words) - 00:24, 30 November 2020
signaling is a technological precursor of dual-tone multi-frequency signaling (DTMF, Touch-Tone), which uses the same fundamental principle, but was used primarily...
6 KB (789 words) - 22:53, 13 September 2024
assigned, thus generating a total of sixteen dual-tone multi-frequency (DTMF) signals. Early keypads only used the keys with the digits 1 through 9 and...
5 KB (572 words) - 17:51, 27 October 2023
handheld that a wired phone was trying to call them. Other systems used DTMF. Some used a system called Secode 2805 which transmitted an interrupted 2805 Hz...
7 KB (884 words) - 18:00, 15 July 2024
Specific Area Message Encoding (redirect from SAME code)
multi-frequency (DTMF) format to transmit data with radio broadcasts. In 1985, the NWS forecast offices began experimenting with placing special digital codes at the...
41 KB (3,402 words) - 03:15, 3 October 2024
multi-frequency signaling (DTMF) BORSCHT functions: battery feed (B), over-voltage protection (O), ringing (R), signaling (S), coding (C), hybrid (H), and test...
7 KB (841 words) - 14:23, 16 September 2024
applications, such as recognition of dual-tone multi-frequency signaling (DTMF) tones produced by the push buttons of the keypad of a traditional analog...
19 KB (2,522 words) - 15:02, 4 October 2024