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The dtmf verb generates a string of DTMF digit signals, which are transmitted as RTP payloads according to RFC 2833. 
{
  "verb": "dtmf",
  "dtmf": "0276",
  "duration": 250
}

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Configuration

The following table lists the available parameters:
ParameterTypeDescriptionRequired
dtmfstringA string containing a sequence of DTMF digits (0-9, *, #).Yes
durationnumberThe length of each digit in milliseconds. The default value is 500.No

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