+DTMF, or Dual-tone multi-frequency signaling, is the sound language of touch-tone telephones. It uses specific pairs of audio frequencies to represent numbers and symbols pressed on a [Telephone](/wiki/Telephone) keypad. This distinct musical "beep" is how your phone communicates, replacing older [Dial Tone](/wiki/Dial_Tone) pulses.
+## See also
+- [Telephony](/wiki/Telephony)
+- [Signal](/wiki/Signal)
+- [Audio](/wiki/Audio)
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