ElevenLabs TTS provider

ElevenLabs requires your own API key configured in your Telnyx account. Telnyx relays requests to the ElevenLabs API — voice settings are passed through directly.

Voice format: elevenlabs.<Model>.<VoiceId> Example: elevenlabs.v3.Adam voice_id is a voice from your own ElevenLabs account — pre-built, cloned, or designed. Preview voices at elevenlabs.io/voice-library.

WebSocket

Query Parameters

Parameter	Type	Default	Description
`audio_format`	string	`mp3`	`mp3`, `linear16`, `mulaw`.
`sample_rate`	integer	—	8000, 16000, 22050, 24000, 44100.
`language`	string	—	BCP-47 language code.

Voice Settings

Relayed directly to the ElevenLabs API. Any field ElevenLabs accepts can be passed here.

Field	Type	Default	Description
`model_id`	string	—	ElevenLabs model override (e.g. `eleven_multilingual_v2`).
`language_code`	string	—	BCP-47. Overrides `language` query param.
`stability`	float	—	0.0–1.0. Voice consistency.
`similarity_boost`	float	—	0.0–1.0. Clarity and similarity to original voice.
`style`	float	—	0.0–1.0. Style exaggeration.
`use_speaker_boost`	boolean	—	Speaker boost toggle for clarity.

{
  "text": " ",
  "voice_settings": {
    "stability": 0.5,
    "similarity_boost": 0.75,
    "style": 0.3
  }
}

REST API

Fields

Field	Type	Default	Description
`model_id`	string	—	ElevenLabs model override.
`stability`	float	—	0.0–1.0. Voice consistency.
`similarity_boost`	float	—	0.0–1.0. Clarity and similarity.
`style`	float	—	0.0–1.0. Style exaggeration.
`use_speaker_boost`	boolean	—	Speaker boost toggle.
`output_type`	string	`binary_output`	`binary_output`, `base64_output`, or `audio_id`.

Response

Default (binary_output): chunked audio bytes. Format determined by ElevenLabs. With output_type: "base64_output": JSON with base64-encoded audio. With output_type: "audio_id": JSON with an audio_url for deferred retrieval.

WebSocket Streaming

REST API

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ElevenLabs TTS provider

WebSocket

Query Parameters

Voice Settings

REST API

Fields

Response

​WebSocket

​Query Parameters

​Voice Settings

​REST API

​Fields

​Response

WebSocket

Query Parameters

Voice Settings

REST API

Fields

Response