Because DTMF tones are simply audio on the line, they can be heard in any conversation or audio recording on the line. These frequencies are described in standards which ensure compatibility between different systems. The combination of two tones of certain frequencies will signify a digit being pressed on the keypad. For more information, see the wikipedia article on DTMF ( ).ĭTMF tones are generated by combining two tones of different frequency.
There are many other applications for this signaling. It features audible tones in the frequency range of the human voice which are typically used when dialing a call (on analog lines) or when operating an IVR menu. DTMF (Dual Tone Multi Frequency) is a type of signaling used primarily in voice telephony systems.
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