abbreviation Technical meaning of DTMF Dual Tone Multi Frequency 3
noun Definition of dtmf in Technology (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. 1
