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

# CHIRP

> Connect a Rasa voice assistant over the CHIRP WebSocket protocol for automated voice testing

<Info>
  **New in 3.17**

  The CHIRP channel is available from Rasa Pro 3.17.
</Info>

Use the CHIRP channel to connect your assistant over a WebSocket audio stream. CHIRP is intended for **automated voice testing** — platforms that simulate callers and need a direct WebSocket connection rather than a telephony provider.

Like [Twilio Media Streams](/docs/reference/channels/twilio-media-streams), Rasa handles ASR and TTS on the server. Unlike telephony channels, there is no phone number or inbound webhook; the test client connects directly to your Rasa server.

## Configuration

Add the following to `credentials.yml`:

```yaml title="credentials.yml" theme={null}
chirp:
  server_url: "<your-domain>"
  username: "<username>"
  password: "<password>"
  asr:
    name: "deepgram"  # or "azure"
    # ASR-specific configuration
  tts:
    name: "deepgram"  # or "cartesia", "azure"
    # TTS-specific configuration
  interruptions:  # optional
    enabled: true
    min_words: 3
```

## WebSocket endpoint

The test client connects to:

```
wss://<your-domain>/webhooks/chirp/websocket
```

Use HTTP Basic Authentication with the `username` and `password` from `credentials.yml`.

## Protocol

Audio is sent in both directions as 16 kHz, signed 16-bit mono PCM in WebSocket binary frames. Optional JSON text frames (`speech.started`, `speech.completed`) signal turn boundaries and support interruption handling.


## Related topics

- [Call Recording](/docs/reference/config/call-recording.md)
- [Rasa Pro Change Log](/docs/reference/changelogs/rasa-pro-changelog.md)
- [Connecting to Messaging and Voice Channels](/docs/reference/channels/messaging-and-voice-channels.md)
- [Custom Connectors](/docs/reference/channels/custom-connectors.md)