![]() One of these carriers (not always the same one) interprets the DTMF tones and translates the audio data into structured data. The call passes through several carriers.The user presses a key and produces DTMF tones.DTMF have been standardized so that they can be understood and decoded by machines. When a user presses a key on their phone, the key press produces Dual-tone multi-frequency signaling (DTMF), which is the source of the familiar sounds you hear when dialing a phone. The TwiML verb works by passing data from touch-tone key presses along to your application.
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