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Sarvam text-to-speech for Bolna AI voice agents

Sarvam Bulbul v3 gives your Bolna voice agent native-sounding speech in Hindi, Tamil, Telugu and 8 more languages, with 16 voices to choose from.

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At a glance

How Sarvam AI (TTS) fits in the stack

Best for

Natural delivery, tone, and response speed on live calls.

Use this layer when

You care about voice quality, expressiveness, or low-latency playback.

Connects to

LLM output upstream and the phone network downstream.

Voice Stack

Text-to-speech is the speaking layer

Text-to-speech is the speaking layer

This provider turns the agent’s response into audio the caller hears. It affects brand perception, caller comfort, and how quickly the next utterance can begin.

TelephonyPhone Network
→
STTListener
→
LLMReasoning
→
TTSVoice
→
ToolsActions

Last updated

What is Sarvam used for in a Bolna voice agent?

Sarvam is the text-to-speech provider that gives your Bolna agent native-sounding voices in 10 Indian languages plus English (India), through its Bulbul v3 model. Pick it for agents that talk to callers across India in Hindi, Tamil, Telugu or other regional languages, where an English-first voice would mispronounce names and places.

How do I set up Sarvam with Bolna?

  1. Optional: connect your own Sarvam API key at platform.bolna.ai/auth/sarvam.
  2. Open your agent in Agent Studio and go to the Languages tab. Pick the language you are configuring, for example Hindi.
  3. In the Voice section, choose Sarvam as the provider and Bulbul v3 as the model.
  4. Pick one of the 16 voices and preview it. Use the Speed rate slider to slow the agent down or speed it up.
  5. If you create the agent through the API, include language in the Sarvam synthesizer config, as a plain code such as hi. It is required.

For voices, languages and configuration, see the Sarvam setup guide in the Bolna docs.

Which Sarvam model, voices and languages does Bolna support?

ModelLanguagesVoices
bulbul:v3English (India), Hindi, Bengali, Tamil, Telugu, Gujarati, Kannada, Malayalam, Marathi, Punjabi, Odia16: Shubh, Ratan, Ashutosh, Amit, Rahul, Sumit, Manan (male), Priya, Ritu, Kavya, Simran, Pooja, Ishita, Shreya, Shruti, Suhani (female)

The same 16 voices work for every supported language, so you choose by tone: Priya, Ritu, Kavya, Simran and Sumit for conversation, Rahul for sales, Shubh for IVR and support, Amit and Ishita for business, and Ratan, Ashutosh and Shreya for news.

What can you build with Sarvam and Bolna?

All-India customer support. Answer each caller in their own language with a voice that sounds local.

Hindi and Hinglish sales calls. Pair Sarvam for the Hindi voice with ElevenLabs for English in one multilingual agent, switching when the caller does. The Hindi text to speech page compares Sarvam's Hindi voices with the other providers on Bolna.

Recruitment screening in Tier 2 and 3 cities. Ask screening questions in the candidate's language, with names and role terms pronounced correctly.

A fully Indic pipeline. Combine Bulbul with Sarvam speech-to-text so both listening and speaking work in Indian languages.

FAQ

Sarvam AI (TTS) on Bolna: frequently asked questions

Sarvam Bulbul v3 covers 11 languages on Bolna, English (India), Hindi, Bengali, Tamil, Telugu, Gujarati, Kannada, Malayalam, Marathi, Punjabi and Odia. Assamese is not one of them.

No. bulbul:v3 is the only Sarvam model Bolna offers. Agents on an older model must move to bulbul:v3 and pick a new voice, because voice ids do not carry across model generations.

Yes. bulbul:v3 is on Bolna's preferred model list at the time of writing, so it is billed inside the flat per-minute rate. Check the Add Funds panel in your dashboard for the current list on your account.

Yes, for a fully Indic pipeline. Note that Sarvam's speech-to-text covers more languages than Bulbul, so a language your agent can transcribe is not always one it can speak.

Related

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Amazon Polly gives your Bolna voice agent low-cost text-to-speech with generative, neural and standard engines across a broad range of locales.

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Azure Text-to-Speech

Azure Text-to-Speech gives your Bolna voice agent Microsoft's neural voices in many languages, covered by Bolna's flat per-minute rate on the neural model.

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Cartesia

Cartesia gives your Bolna voice agent fast Sonic text-to-speech in 42 languages, including Hindi, with voice cloning and your own API key.

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Keep exploring the voice stack

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Text-to-Speech

Text-to-speech turns your agent responses into spoken audio. Voice quality shapes how callers perceive your brand. Flat, robotic speech kills trust while natural, expressive voices build it. Bolna integrates with the fastest TTS providers so responses sound human and arrive without awkward pauses.

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Telephony

Telephony providers connect your voice agents to the phone network so they can make and receive real calls. Bolna supports managed integrations with major carriers as well as bring-your-own-carrier via SIP trunking, giving you full control over call routing, number provisioning, and cost.

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Large Language Models

The LLM is the brain of your voice agent. It understands what callers say and decides how to respond. Bolna lets you switch between models like GPT-5.4 mini, Claude and DeepSeek by changing the provider and model in your agent LLM settings, so you can tune for speed, cost or reasoning depth.

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Speech-to-Text

Speech-to-text converts what callers say into text that your LLM can process. Transcription accuracy and latency directly affect how natural a conversation feels. Bolna supports streaming STT providers optimized for telephony audio, including specialized models for Indian languages.

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Tools & Workflows

Tools let your voice agents take action during a call, not just talk. Book a calendar slot, look up an order through your own API, push a lead into your CRM, or trigger a multi-step automation in Zapier. These integrations turn voice agents from answering machines into workflow engines.

See where Sarvam AI (TTS) fits in your production workflow

Use the demo to walk through provider selection, stack tradeoffs, and the exact workflow you want Bolna to automate.

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