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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.
CEFCU, the leading Central Illinois credit union, agreed to be the presenting sponsor for the American Lung Association in Illinois’ Fight For Air Climb at Wyndham Springfield City Centre, set ...
Multifrequency signaling is a technological precursor of dual-tone multi-frequency signaling (DTMF, Touch-Tone), which uses the same fundamental principle, but was used primarily for signaling address information and control signals from a user's telephone to the wire-center's Class-5 switch. DTMF uses a total of eight frequencies.
Introduced to the public in 1963 by AT&T, Touch-Tone dialing greatly shortened the time of initiating a telephone call. It also enabled direct signaling from a telephone across the long-distance network using audio-frequency tones, which was impossible with the rotary dials that generated digital direct current pulses that had to be decoded by ...
CEFCU may refer to: Caltech Employees Federal Credit Union (1950), La Cañada Flintridge, California; Citizens Equity First Credit Union (1937), Peoria, Illinois — also operates in California; formerly Caterpillar Employees' Credit Union (CECU), then Construction Equipment Federal Credit Union (CEFCU)
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.
This page was last edited on 26 June 2011, at 10:15 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike License 4.0; additional terms may ...
Touch-tone data entry (TDE) means that the respondent enters the answers by pressing the appropriate numeric keys on a telephone handset. The interviewer is not present . Interactive voice response (IVR) includes a wide range of approaches for voice communication with a computer using the telephone.
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.
The most commonly used telephone sets for the 1A2 systems were modifications of the Bell System standard 500-series telephones for rotary dial systems, and the 2500-series Touch-Tone desk sets.