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

# Control Turn Taking with VAD Modes

> Choose the voice activity detection (VAD) mode that decides when a caller has finished speaking. Compare asap_v1, asap_v2, and the Deepgram Flux pipeline.

Turn taking decides when the caller has finished speaking and the agent may reply. The `turnTaking` feature selects the voice activity detection (VAD) mode for the main customer call.

**What you'll learn:** What each VAD mode does, how to select one, and how the Flux mode falls back on unsupported languages.

## Configuration

Set the mode at `config.features.turnTaking`:

```json theme={"theme":{"light":"github-light","dark":"github-dark"}}
{
  "config": {
    "features": {
      "turnTaking": {
        "version": "v1",
        "vad": "asap_v2"
      }
    }
  }
}
```

In the UI, the setting lives on the **Voice & Speech** tab under **Turn Taking**.

## VAD modes

| Mode      | Behavior                                                                                                                                          |
| --------- | ------------------------------------------------------------------------------------------------------------------------------------------------- |
| `asap_v1` | Legacy VAD behavior.                                                                                                                              |
| `asap_v2` | Improved VAD tuned for faster turn detection. **Default.**                                                                                        |
| `flux`    | Runs speech recognition and turn detection on the Deepgram Flux pipeline, which models end of turn directly instead of relying on silence length. |

Omitting `turnTaking` or `vad` uses `asap_v2`.

## Flux language support and fallback

The Flux pipeline supports these languages: English, Spanish, French, German, Hindi, Russian, Portuguese, Japanese, Italian, and Dutch.

<Note>
  If the agent's language is not in this list, or the Flux connection fails at call start, the call automatically falls back to the legacy VAD pipeline. The call proceeds normally either way.
</Note>

## Scope

The setting applies only to the main customer call. Warm-transfer and operator legs keep their own defaults.