The world’s most multilingual voice AI platform.

Two separate products, priced separately. The Pāṇini TTS API ($0.0434/min) is a pure text-to-speech API — you send text, you get back audio. Use it to add voice output to your own app, IVR, or pipeline. The voice calling plan ($0.055/min) is the full end-to-end agent stack: speech-to-text, LLM reasoning, Pāṇini TTS output, telephony (actual phone call), and workflow orchestration — all bundled. If you're building a phone agent that makes or receives calls, you want the calling plan. If you just need TTS audio in your own system, use the API.

Pāṇini TTS is trained for telephony conditions — not just clean studio audio. Natural pacing, accurate intonation, and proper prosody across 220+ languages. You can also clone a custom voice from a short sample, so agents sound like your brand rather than a generic AI voice. Audio is streamed rather than generated as a single block, so there's no lag waiting for a full sentence to render.

Interruptions are handled in real time — the agent stops speaking, listens, and continues from where it needs to. Background noise, poor line quality, and silence are all handled by the STT layer, which is trained on real telephone audio. Hold music is detected so the agent doesn't speak into it. These are common failure points on other platforms; they're accounted for by default here.

End-to-end latency is under 500ms — measured from when the caller finishes speaking to when the agent starts responding. Audio is streamed as the LLM generates output rather than waiting for a complete response, which keeps the conversation feeling continuous. Latency is consistent across all 220+ supported languages.

220+ languages through Pāṇini TTS — including Hindi, Arabic, Spanish, Mandarin, Portuguese, French, Swahili, Tamil, Bengali, Tagalog, and hundreds more. Major regional dialects are covered within those languages. Every language is billed at the same rate with no extra setup — one agent configuration works across all markets.

Both. SonexLabs provides managed phone numbers ready to use immediately. If you already have numbers with Twilio, Exotel, or another provider, you can connect them without migration. Inbound calls route to your agent automatically; outbound campaigns dial from your number. WhatsApp and SMS are available as add-ons.

Yes. The agent queries your systems during the conversation, not just at the start. We support MCP, REST API calls, webhooks, and native connectors for HubSpot, Salesforce, and others. A caller asks about their order; the agent fetches the answer live and responds without putting them on hold.

Live transfer is built in. You configure the escalation trigger — a keyword, a sentiment threshold, a specific intent, or a fallback after a set number of failed turns — and the agent hands off instantly with full conversation context passed to the human. No retelling the story. If no agent is available, the AI can take a message, schedule a callback, or complete the fallback flow itself.

Yes, no card required. The free tier includes 10,000 TTS characters and one voice clone. Unlimited agents, SonexFlows workflow builder, full API access, CRM integrations, MCP and tool calling, RBAC, and webhooks are included at no cost. You pay only for usage: $0.0434/min for Pāṇini TTS API, or $0.055/min for full end-to-end voice calling.

All calls, transcripts, and customer records are encrypted end-to-end in transit and at rest. Every workspace is tenant-isolated — no data crosses between clients. SonexLabs is GDPR, CCPA, HIPAA-ready, and DPDP compliant, with full audit trails on every access event. Enterprise customers can deploy in a private VPC or on-premises for complete data residency control.