--- title: Soniox TTS Now Available for Telnyx Voice AI canonical: https://telnyx.com/release-notes/soniox-tts-voice-ai --- # Soniox TTS Now Available for Telnyx Voice AI [Release notes](https://telnyx.com/release-notes) # Soniox TTS Now Available for Telnyx Voice AI ### 25, Sep 2026 Soniox text-to-speech is now available for Telnyx Voice AI, adding about 200 voices that each speak 60 languages from one model to the voice provider catalog. ### What's new * **Soniox TTS provider:** Select Soniox voices using the `Soniox.tts-rt-v2.` format, with about 200 voices in the catalog including `Soniox.tts-rt-v2.Adrian`, `Soniox.tts-rt-v2.Emma`, and `Soniox.tts-rt-v2.Nina`. * **60 languages from one model:** Every Soniox voice speaks every supported language, including English, Spanish, French, German, Portuguese, Hindi, Japanese, and Arabic. Set `language` to the two-letter ISO 639-1 code of the text, with `en` as the default. On Voice AI Assistants, one voice follows the caller when they change language during a call. * **Precise alphanumeric rendering:** Soniox built the model to render phone numbers, email addresses, IDs, verification codes, and account numbers accurately. * **Low-latency streaming synthesis:** Stream speech over WebSocket or REST with telephony-native 8 kHz `pcm_mulaw` and `pcm_alaw` output. * **Available across Telnyx voice surfaces:** Use Soniox voices in Voice AI Assistants, the Telnyx TTS API (`POST /v2/text-to-speech/speech` and WebSocket streaming), Call Control `speak`, `gather_using_speak`, and conference `speak` commands, and TeXML ``. * **Speed and pacing controls:** Set `speed` from `0.7` to `1.3`, and set `reduce_silence` to shorten the pauses between words. * **Plain text input:** Write prompts as plain text. SSML is not supported, and each request is capped at 2 minutes of audio. ### Why it matters * Telnyx is the infrastructure voice agents run on: telephony, STT, TTS, and agent orchestration in one platform, instead of a Frankenstack of four to six vendors stitched together. * [Soniox STT is already available](https://telnyx.com/release-notes/soniox-stt-voice-ai) on Telnyx, so teams can now run both sides of the conversation, listening and speaking, with one speech AI provider. * Every voice speaks every supported language, so teams build one agent voice that serves callers across 60 languages with no per-language model switching or voice swapping. * Teams serving callers in several markets can give an agent one consistent voice across all of them, instead of picking a different voice or vendor per language. ### Example use cases * Support agents that read verification codes, account numbers, and contact details back to callers with accurate alphanumeric rendering. * Global contact centers serving callers in 60 languages from a single voice, including mixed-language conversations. * Developers building conversational agents that pair Soniox STT with Soniox TTS for consistent speech quality across listening and speaking. * Product teams adding voices to Call Control or TeXML call flows without adding another vendor to the stack. ### Getting started 1. In Mission Control, navigate to AI, then Assistants, then select your assistant. 2. Open the Voice tab. 3. Choose Soniox as the provider and pick a voice. 4. Save the assistant and test with real caller audio before routing production traffic. For API-based call flows, pass a Soniox voice to `POST /v2/text-to-speech/speech`, over WebSocket streaming, or in a Call Control or TeXML call. Set `language` to the language of the text. Soniox lists the full set of [supported languages](https://soniox.com/docs/tts/concepts/supported-languages). Example REST request: { "text": "Your verification code is 4729. We sent it to [[email protected]](https://telnyx.com/cdn-cgi/l/email-protection).", "voice": "Soniox.tts-rt-v2.Adrian", "voice_settings": { "language": "en" } } In TeXML, set the voice and language on ``: Buongiorno, come posso aiutarla? **Learn more** in the [Soniox provider docs](https://developers.telnyx.com/docs/voice/tts/providers/soniox), the [Available Voices catalog](https://developers.telnyx.com/docs/voice/tts/available-voices), or the [Telnyx Text-to-Speech overview](https://developers.telnyx.com/docs/voice/programmable-voice/tts). 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