> ## 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.

# Sukhan

> Telnyx Sukhan is an Urdu text-to-speech model with a curated set of 14 voices, ideal for Urdu-language voice agents on the Telnyx TTS API.

**Voice format:** `Telnyx.Sukhan.<voice_id>`

Urdu-only voice model, 14 curated voices. No prosody controls (speed/pitch) or language selection — each voice speaks Urdu only. Native audio is 22050Hz.

## Voice Samples

| Voice                            | Gender | Accent   |
| -------------------------------- | ------ | -------- |
| `Telnyx.Sukhan.urdu-professor`   | Male   | Standard |
| `Telnyx.Sukhan.news-reader`      | Female | Standard |
| `Telnyx.Sukhan.sindhi-networker` | Male   | Sindhi   |
| `Telnyx.Sukhan.podcast-host`     | Male   | Standard |

Browse the full 14-voice catalogue via the [Voices API](https://developers.telnyx.com/api-reference/text-to-speech-commands/list-available-voices).

***

## WebSocket

### Query Parameters

```
wss://api.telnyx.com/v2/text-to-speech/speech?voice=Telnyx.Sukhan.urdu-professor
```

| Parameter      | Type    | Default | Description                                    |
| -------------- | ------- | ------- | ---------------------------------------------- |
| `audio_format` | string  | `mp3`   | `mp3`, `linear16`. `wav` is **not** supported. |
| `sample_rate`  | integer | `22050` | Only `22050` (native) is supported.            |

### Voice Settings

None. No prosody controls are exposed — `voice_speed` and other settings have no effect if sent. The init frame only needs `{"text": " "}`.

## REST API

### Fields

| Field             | Type    | Default         | Description                                      |
| ----------------- | ------- | --------------- | ------------------------------------------------ |
| `response_format` | string  | native          | `pcm`, `mp3`. `wav` is **not** supported.        |
| `sampling_rate`   | integer | `22050`         | Only `22050` (native) is supported.              |
| `output_type`     | string  | `binary_output` | `binary_output`, `base64_output`, or `audio_id`. |

### Response

Default (`binary_output`): chunked audio bytes, 22050Hz signed 16-bit LE mono (native PCM, transcoded to MP3 on request).

With `output_type: "base64_output"`: JSON with base64-encoded audio.

With `output_type: "audio_id"`: JSON with an `audio_url` for deferred retrieval.

<Warning>
  `sampling_rate`/`sample_rate` values other than `22050` are rejected with a `400` error. Unsupported format values are also rejected — REST `response_format` accepts only `pcm`/`mp3`; WebSocket `audio_format` accepts only `mp3`/`linear16` (its PCM equivalent). Neither accepts `wav`.
</Warning>