> ## Documentation Index
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# DTMF

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).

```json theme={null}
{
  "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](/voice-gateway/references/events/RECOGNIZED_DTMF)