Natural

Telnyx Natural is a low-latency English text-to-speech model backed by Rime Mist, designed for real-time voice agents and conversational applications.

Voice format: Telnyx.Natural.<voice>

Pre-built English voices backed by Rime Mist.

Voice Samples

Voice	Gender	Sample
Telnyx.Natural.allison	Female
Telnyx.Natural.brook	Female

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WebSocket

Query Parameters

wss://api.telnyx.com/v2/text-to-speech/speech?voice=Telnyx.Natural.allison&audio_format=mp3

Parameter	Type	Default	Description
audio_format	string	mp3	mp3, linear16.
sample_rate	integer	24000	8000, 16000, 22050, 24000, 44100, 48000, 96000.

Voice Settings

Send in the init frame ({"text": " "}):

Field	Type	Default	Description
voice_speed	float	1.0	Speech rate multiplier.

{
  "text": " ",
  "voice_settings": {
    "voice_speed": 1.2
  }
}

REST API

Fields

Field	Type	Default	Description
voice_speed	float	1.0	Speech rate multiplier.
output_type	string	binary_output	binary_output, base64_output, or audio_id.

Response

Default (binary_output): chunked audio bytes with Content-Type: audio/mpeg (or audio/wav, audio/pcm).

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

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