--- title: Voice AI - Supported Languages & Recommended Stacks slug: intelligent-voice-agents/voice-ai-supported-languages-and-recommended-stacks createdAt: 2026-07-29T06:42:08.889Z --- *Availability tiers evolve as new languages are validated — check with your Exotel representative for the latest information.* ### How a voice agent is assembled Every Exotel voice bot is built from three interchangeable pieces. When you set up a language in the console, you're choosing (or accepting the recommended default for) each one: - **Speech-to-Text (STT / ASR)** — transcribes what the caller says. - **LLM** — understands the caller and decides what to say back. - **Text-to-Speech (TTS) + Voice** — speaks the reply in a natural voice. Noise suppression and turn detection are applied by default on every stack, so you don't need to configure them. ### Choosing your stack when you add a language When you select a new language in the console, use this three-step guide: 1. **Find your primary language** in the tables below — this is the language the bot mainly listens in and speaks. 2. **Pick one option from each column** (STT, LLM, TTS/Voice). Where two providers are listed, either works; pick one and keep it consistent across STT and TTS, because some secondary-language and code-switching behaviour only works when STT and TTS come from the same provider (noted per row). **Availability** - **Certified (Generally Available)** — Fully validated across multiple datasets and evaluations. - **Beta** — Live in production with real customer deployments and improving continuously. - **Alpha (Early Access)** — Available for experimentation and to take to Beta. ### Certified languages | Language | STT (pick one) | LLM | TTS / Voice | Secondary language in same call | Proven use cases | | ---------------- | ------------------------ | ----- | ---------------------------------------------------- | ------------------------------- | ------------------------------------------------- | | **English** (en) | Deepgram *or* ElevenLabs | Gemma | Smallest AI *or* ElevenLabs — voice *Avni* (default) | Hindi | Customer Care, Collections, Hospital Appointments | | **Hindi** (hi) | Deepgram *or* ElevenLabs | Gemma | Smallest AI *or* ElevenLabs — voice *Avni* (default) | English | Customer Care, Collections, Hospital Appointments | ### Beta languages | Language | STT (pick one) | LLM | TTS / Voice | Secondary language in same call | Proven use cases | | --------------- | ---------------------------- | ------ | ---------------------------- | --------------------------------------------------- | ---------------- | | **Arabic** (ar) | ElevenLabs *or* Speechmatics | Gemini | ElevenLabs *or* Amazon Polly | English — only when both STT and TTS are ElevenLabs | Order Status | ### Alpha / Early Access — Indian languages | Language | STT (pick one) | LLM | TTS (pick one) | Secondary languages in same call | Proven use cases | | ------------------ | ---------------------- | ----------------------------------- | ------------------------------ | ------------------------------------------------------------- | ------------------------------- | | **Tamil** (ta) | ElevenLabs *or* Gemini | Gemma *or* Gemini (no-thinking) | ElevenLabs *or* Gemini | English & Hindi (ElevenLabs); Hindi, English & Indic (Gemini) | Collections | | **Telugu** (te) | Gemini *or* Sarvam | Gemini | Gemini *or* Sarvam | Hindi, English & Indic (Sarvam or Gemini) | Collections | | **Marathi** (mr) | ElevenLabs *or* Gemini | Gemini | ElevenLabs *or* Gemini | English & Hindi (ElevenLabs); Hindi, English & Indic (Gemini) | Collections, KYC | | **Kannada** (kn) | Azure *or* Sarvam | Gemini 2.5 Flash *or* Gemma 3 (26B) | Google *or* Sarvam | English, Hindi, Tamil, Telugu, Malayalam (Gemini or Sarvam) | Customer Care, Collections | | **Malayalam** (ml) | Azure *or* Sarvam | Gemini 2.5 Flash *or* Gemma 3 (26B) | Google *or* Sarvam | English, Hindi, Tamil, Kannada, Telugu (Gemini or Sarvam) | Customer Care, Collections, KYC | | **Gujarati** (gu) | Azure *or* Sarvam | Gemini 2.5 Flash *or* Gemma 3 (26B) | Google, Sarvam *or* ElevenLabs | English, Hindi, Marathi (Gemini or Sarvam) | Collections, Lead Qualification | | **Bengali** (bn) | Azure *or* Sarvam | Gemini 2.5 Flash | Google *or* Sarvam | English, Hindi (Gemini or Sarvam) | Customer Care, Collections | | **Punjabi** (pa) | Azure *or* Sarvam | Gemini 2.5 Flash *or* Gemma 3 (26B) | Sarvam | English, Hindi (Sarvam) | Collections | | **Odia** (or) | Azure *or* Sarvam | Gemini 2.5 Flash | Sarvam | English, Hindi (Sarvam) | Customer Care | ### Alpha / Early Access — International languages | Language | STT (pick one) | LLM | TTS (pick one) | Secondary language in same call | Proven use cases | | --------------------------------- | ----------------------- | ------------------------------------------------------------ | ------------------------ | ---------------------------------------------- | ------------------------------- | | **Indonesian / Bahasa** (id) | Speechmatics *or* Azure | Gemini 2.5 Flash *or* Gemma 3 (26B) | ElevenLabs *or* Google | English (ElevenLabs or Speechmatics) | Rider Onboarding, Customer Care | | **Filipino / Tagalog** (fil / tl) | Speechmatics *or* Azure | Gemma 3 (26B), Gemini 2.5 Flash *or* Gemini 2.5 Flash (Fast) | ElevenLabs *or* Cartesia | English (ElevenLabs, Speechmatics or Cartesia) | Customer Care, Collections | | **Malay / Bahasa** (ms) | Azure *or* Speechmatics | Gemini 2.5 Flash | ElevenLabs | English (ElevenLabs) | Customer Care | | **Vietnamese** (vi) | Azure | Gemini 2.5 Flash | Google | English (Google) | Customer Care | | **Thai** (th) | Azure | Gemini 2.5 Flash | Google | English (Google) | Customer Care | | **Swahili** (sw) | Azure *or* Speechmatics | Gemini 2.5 Flash *or* Gemma 3 (26B) | Google *or* ElevenLabs | English (Google or ElevenLabs) | Customer Care, Rider Onboarding | | **Japanese** (ja) | Azure | Gemini 2.5 Flash *or* GPT-4.1 Mini | Google *or* Cartesia | English (Google or Cartesia) | Customer Care | | **Mandarin Chinese** (cmn) | Azure | Gemini 2.5 Flash | Google | English (Google) | Customer Care | | **French** (fr) | Azure | Gemini 2.5 Flash | Google *or* ElevenLabs | English (Google or ElevenLabs) | Customer Care | | **Spanish** (es) | Azure | Gemini 2.5 Flash | Google *or* ElevenLabs | English (Google or ElevenLabs) | Customer Care | | **German** (de) | Azure | Gemini 2.5 Flash | Google | English (Google) | Customer Care | **Notes** - To use a secondary language in the same call (code-switching), keep STT and TTS on the provider named in that row — mixing providers may disable it. - For the full voice catalogue per language, ask your Exotel contact for the voice library.