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Dtmf

Definition​

The Dtmf verb is used to send Dual-Tone Multi-Frequency (DTMF) tones during a call. DTMF tones are the sounds generated when you press the keys on a telephone keypad.

The Dtmf verb enters the symbols within its tags. This can be useful when dialing a phone number with an extension.

Values accepted for the Dtmf verb are: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, #, *, ,, and the combinations of these characters. Each comma character defines a 0.5-second delay.

Nesting Rules​

  • You cannot nest other verbs or nouns within the Dtmf verb.
  • You cannot nest the Dtmf verb within other FlexML verbs.

Example​

In these example FlexML instructions, the phone number in the Dial verb is dialed, and then the characters within the Dtmf tags are entered. Each comma within the Dtmf tag is a 0.5-second delay.

The Dtmf verb is used to enter the DTMF tones after the call is answered. The Dial verb has a timeLimit attribute set to 15 seconds, and the hangupOnStar attribute is set to true, which means that if the user presses the star key, the call will be hung up.

<Response>
  <Dial timeLimit="15" hangupOnStar="true">
    <Number>15162065340</Number>
  </Dial>
  <Dtmf>,,,,12</Dtmf>
</Response>