# Parameters

Configure the session in the query string, as with Deepgram. Deepgram parameters that have no effect here are accepted, so plugins can keep their defaults.

## Query parameters

| Parameter | Values |
| --- | --- |
| `encoding` | `linear16`, the default; `mulaw`; or `alaw`. |
| `sample_rate` | Required: 16000 or 24000 for `linear16`, 8000 for `mulaw` and `alaw`. |
| `language` | A tag from the [language list](https://dotwave.ai/docs/realtime/languages/). Leave it out, or set `multi`, for automatic detection. With a client secret, leave it out or repeat the secret’s language. |
| `utterance_end_ms` | The pause that ends a segment, from 400 to 3200. |
| `interim_results` | `true`, the default, sends interim `Results` while a segment grows; `false` sends only finals. |
| `model` | Accepted, and can stay at your plugin’s default. It must not be empty. |
| `punctuate`, `smart_format` | Accepted. |
| `endpointing` | Accepted, with nothing to set: segments end after `utterance_end_ms`. |
| `channels` | `1`: audio must have one channel. |
| `diarize`, `multichannel`, `keywords` | Refused, with an error that names the parameter. |

## Audio formats

| Audio | Query parameters |
| --- | --- |
| PCM16, 24 kHz | `encoding=linear16&sample_rate=24000` |
| PCM16, 16 kHz | `encoding=linear16&sample_rate=16000` |
| G.711 μ-law, 8 kHz | `encoding=mulaw&sample_rate=8000` |
| G.711 A-law, 8 kHz | `encoding=alaw&sample_rate=8000` |

Send audio as binary messages, in chunks of any size, at the speed of speech: the server holds up to 640 ms ahead of real time, and audio sent faster ends the session.