## Documentation Index

Fetch the complete documentation index at: [/llms.txt](https://docs.cognigy.com/llms.txt)

Use this file to discover all available pages before exploring further.

The `dtmf` verb generates a string of DTMF digit signals, which are transmitted as RTP payloads according to [RFC 2833](https://datatracker.ietf.org/doc/html/rfc2833).

```
{
  "verb": "dtmf",
  "dtmf": "0276",
  "duration": 250
}
```

## Configuration

The following table lists the available parameters:

| Parameter | Type | Description | Required |
| --- | --- | --- | --- |
| dtmf | string | A string containing a sequence of DTMF digits (`0-9`, `*`, `#`). | Yes |
| duration | number | The length of each digit in milliseconds. The default value is `500`. | No |

## More Information

- [RECOGNIZED_DTMF](https://docs.cognigy.com/voice-gateway/references/events/RECOGNIZED_DTMF)

Last modified on June 10, 2026