DTMF Code

Dual-tone Multi-frequency code or DTMF is a response code that is created when an end user presses the numbers on a mobile or landline phone’s keypad. All numbers are identified in a unique way with the DTMF code that can be transferred and interpreted on the receiver side. DTMF code signaling allows reception of information from the end user e.g. PIN code during a voice call.

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