> For a complete documentation index, fetch https://docs.voximplant.ai/llms.txt

# DTMFType

## Values

**`ALL`** `0`

All types of DTMF tones trigger the `CallEvents.ToneReceived` event: in-band, RFC 2833 and SIP INFO. Receiving an RFC 2833 tone disables processing of in-band tones to avoid duplicating

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**`TELEPHONE_EVENT`** `1`

Only RFC 2833 DTMF tones trigger the `CallEvents.ToneReceived` event

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**`IN_BAND`** `2`

Only in-band DTMF tones trigger the `CallEvents.ToneReceived` event

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**`SIP_INFO`** `3`

Only SIP INFO DTMF tones trigger the `CallEvents.ToneReceived` event

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> The DTMF type.