dtmfSent - Cognigy Documentation

Emitted when the SDK passes DTMF tones to the SIP library during a call via sendDTMF(). The SDK might queue later tones, so the event doesn’t confirm that the tones were played or that the remote party received them. If sendDTMF() fails, the event isn’t emitted. This event is available since SDK version 0.2.0.

Category

Info Message

Callback parameters

Parameter	Type	Description
`tones`	`string`	The tones that the SDK sent. If you passed a number to `sendDTMF()`, the value is the number converted to a string.

Example

client.on('dtmfSent', (tones) => {
  console.log('DTMF tones sent:', tones);
});

More information

Last modified on November 11, 2026