Dual Tone Multi Frequency


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Dual Tone Multi Frequency

(communications)
(DTMF, or "touch-tone") A method used by the telephone system to communicate the keys pressed when dialling. Pressing a key on the phone's keypad generates two simultaneous tones, one for the row and one for the column. These are decoded by the exchange to determine which key was pressed.
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Calls arrive at the call center based on Dual Tone Multi Frequency (DTMF) menu selections for the Highway Division from the main DOT number (857-DOT-INFO).
TDK's modem chip features the full AT command set and dual tone multi frequency (DTMF) tone generation and detection.
Previously, the road conditions telephone system was based on a dual tone multi frequency (DTMF), or 'touch-tone,' interface that required users to access information by entering numerical codes.
In addition Dual Tone Multi Frequency is also supported in order to support touch-tone services used by computer telephony systems.

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