DTMF (Dual Tone Multifrequency Signalling): a signalling system used to transmit dialling in analogue switching. Uses two of five frequencies to form the different digits of a touch-tone phone. Also known as Q 23 or Voice Frequency signalling.
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More information >DTMF (Dual Tone Multifrequency Signalling): a signalling system used to transmit dialling in analogue switching. Uses two of five frequencies to form the different digits of a touch-tone phone. Also known as Q 23 or Voice Frequency signalling.