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What characters can be detected via keypad input?

Question

  • What DTMF characters can be recognized?
  • How are DTMF tones handled?
  • Can I collect digits via Voice API?

Answer

Using the Voice API or SIP, you can receive keypad input from a user via DTMF. For Voice API, this is collected using an Input action, while the DTMF will be relayed to your SIP endpoint for SIP calls.

 

The characters that the Vonage API Platform recognizes are:

1 2 3 4 5 6 7 8 9 0 * #

 

Please be careful when building applications for different regions. Some regions will call # the "hash key", while others call it the "pound key". Also, some regions refer to * as the "star key*, while others call it the "asterisk key".

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