> ## Documentation Index
> Fetch the complete documentation index at: https://docs-classic.cognigy.com/llms.txt
> Use this file to discover all available pages before exploring further.

# DTMF

> The verb for playing touch-tone sounds during a call.

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


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