Dual-tone multi-frequency signaling (DTMF) is a telecommunication signaling system using the voice-frequency band over telephone lines between telephone...
19 KB (2,137 words) - 22:50, 12 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) - 06:30, 3 September 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
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
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) - 13:49, 31 August 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
proprietary code to the VXML standard. DTMF decoding and speech recognition are used to interpret the caller's response to voice prompts. DTMF tones are...
27 KB (3,511 words) - 14:49, 4 June 2024
(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