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

North America. The gradual adoption of DTMF dialing eventually made dialing speed the same for all area codes. On February 1, 1984, in response to a request...

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 in Carnegie, Pennsylvania and increased its use in Greensburg...

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...

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

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...

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...

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 –...

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

Dial peer Dial tone Distribution frame Dual-tone multi-frequency signaling (DTMF) Emergency telephone number End instrument Engset calculation Erlang unit...

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...

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...

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...

The calling sequence can contain dialable numbers such as digits 0–9 and DTMF tones ABCD*#, formatting characters ␣ . -, and control characters ! P T ...

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...

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...

accepted DTMF "touch tones" or other tone signaling systems. A transitional technology (from pulse to DTMF) had converters to convert DTMF to pulse,...

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....

& 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...

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...

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...

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...

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...

applications, such as recognition of dual-tone multi-frequency signaling (DTMF) tones produced by the push buttons of the keypad of a traditional analog...

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...

multi-frequency signaling (DTMF) BORSCHT functions: battery feed (B), over-voltage protection (O), ringing (R), signaling (S), coding (C), hybrid (H), and test...

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...

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...

signaling is a technological precursor of dual-tone multi-frequency signaling (DTMF, Touch-Tone), which uses the same fundamental principle, but was used primarily...