Definitions for "DTMF"
Dual Tone Multiple Frequency: also known as "touch-tones" received by depressing the telephone keypad (unavailable with rotary phones).
ual- one- ulti- requency; an in-band signaling system that uses two simultaneous voice-band tones for dialing. Also called touch tone.
Dual-Tone Multi-Frequncy aka Touch-Tone(tm). A standard set of 8 tones, used for paging, ANI, remote control or interconnect applications.
Keywords:  element
The dtmf Element