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

# Soniox WebSocket TTS provider

> Configure the Soniox text-to-speech provider for Telnyx WebSocket TTS, including voices, language, speed, audio formats, and sample rates.

<Info>
  This page applies when `provider=soniox` — either via the `voice` compound parameter or by setting `provider=soniox` explicitly. See [Configuration](/docs/voice/tts/websocket-streaming/configuration).
</Info>

## Voice Format

```
Soniox.tts-rt-v2.<VoiceId>
```

Example: `Soniox.tts-rt-v2.Emma`

## Models

| Model | Description |
| - | - |
| `tts-rt-v2` | Real-time model. **Default** and the only model accepted. |

## Voices

Around 200 voices under `tts-rt-v2`; every voice speaks all supported languages. Browse the full catalog via the [Voices API](https://developers.telnyx.com/api-reference/text-to-speech-commands/list-available-voices); samples are on the [Soniox provider page](/docs/voice/tts/providers/soniox).

## Language

Set `voice_settings.language` on the init frame, or the `language` query parameter, to the two-letter ISO 639-1 code of the text, for example `en`, `it`, or `pt`. The default is `en`. The [Soniox provider page](/docs/voice/tts/providers/soniox#language) lists the supported languages.

## Voice Settings

| Field | Type | Default | Description |
| - | - | - | - |
| `language` | string | `en` | Two-letter ISO 639-1 code of the text. |
| `speed` | float | `1.0` | Speaking rate, `0.7` to `1.3`. |
| `reduce_silence` | boolean | `false` | Shortens the pauses between words. |

```json theme={null}
{
  "text": " ",
  "voice_settings": {
    "language": "it",
    "speed": 1.1,
    "reduce_silence": true
  }
}
```

SSML is not supported. Send plain text.

## Audio Output

Streamed delivery. Default: MP3 at 24 kHz. Use the `audio_format` and `sample_rate` query parameters to change the output:

| `audio_format` | Accepted Sample Rates (Hz) | Default |
| - | - | - |
| `mp3` | 16000, 24000, 44100, 48000 | 24000 |
| `wav` | 8000, 16000, 24000, 44100, 48000 | 24000 |
| `linear16` | 8000, 16000, 24000, 44100, 48000 | 24000 |
| `mulaw` | 8000 | 8000 |
| `alaw` | 8000 | 8000 |

```
wss://api.telnyx.com/v2/text-to-speech/speech?voice=Soniox.tts-rt-v2.Emma&audio_format=mulaw
```

## Limits

A request produces up to two minutes of audio. Split longer text into several requests.