Dual-tone multi-frequency signaling (DTMF) is a telecommunication signaling system using the voice-frequency band over telephone lines between telephone...

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...

System in the United States officially introduced dual-tone multi-frequency (DTMF) technology under its registered trademark Touch-Tone.[citation needed] Over...

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...

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...

Multiple Frequency (DTMF), and Continuous Tone Coded Squelch System (CTCSS). A DTMF selective signaling PMRS system uses a code sequence of discrete...

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...

in this case a specific digital code. Selective calling systems can overlap; a radio may have (group call) and DTMF individual calling. Selective calling...

(MDCT) coding. Dual-tone multi-frequency signaling (DTMF), fax transmissions, and high-quality audio cannot be transported reliably with this codec. DTMF requires...

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...