Twilio voice AI for India —
keep your trunk, add native Indian-language agents
Twilio has the best Indian phone number procurement and SIP trunk reliability. ThinnestAI is the missing voice AI layer for Indian languages at flat ₹1.5/min. Use both — BYOK Twilio in ThinnestAI, no markup, no migration.
The architecture
[Customer phone]
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[Twilio SIP trunk + Indian phone number] <- you own this
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v
[LiveKit room] <- managed by ThinnestAI
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v
[ThinnestAI voice agent: STT + LLM + TTS] <- BYOK each layer
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[Your CRM / Shopify / HMS webhook] <- you own thisThinnestAI is the orchestration layer; Twilio is the carrier. They complement.
Twilio + ThinnestAI vs Twilio Voice Intelligence
Twilio has "Voice Intelligence" — their first-party AI layer. It's English-first, US-priced, and marketed for English call flows.
| Aspect | Twilio Voice Intelligence | ThinnestAI on Twilio trunk |
|---|---|---|
| Platform fee | $0.10/min | ₹1.5/min (~$0.018) |
| Indian language quality | English-first, configurable | 22 Indian languages production-ready |
| DLT/RBI/DPDPA defaults | Manual | Hard-coded |
| INR billing | No | Default with GST |
| BYOK STT/LLM/TTS | Limited (Twilio-managed providers) | Yes — every provider |
5× pricing difference. And ThinnestAI has the Indian-language quality, DLT defaults, and INR billing.
Twilio Voice Intelligence is great if you're already a Twilio-shop wanting one bill. For Indian operations, ThinnestAI on top of Twilio's trunk produces a cheaper, more multilingual outcome.
Migration from Twilio Studio in 3 steps
1. Keep your Twilio number, SIP trunk, and DLT registration.
No changes here. Your existing setup stays as-is.
2. Replace your Twilio Studio TwiML flow with a single ThinnestAI agent webhook.
ThinnestAI provides a SIP redirect URL. Update your phone number's "When a call comes in" webhook to that URL.
3. Build your agent in ThinnestAI's no-code flow editor.
Or paste a system prompt. Agent handles STT/LLM/TTS; Twilio handles call mediation.
Migration time: half a day for a single agent flow. Most teams keep both running in parallel for a week to A/B test.
DLT compliance — the Twilio gotcha
Twilio India numbers REQUIRE DLT registration to make outbound calls. ThinnestAI's templates inherit your DLT registration — no double-registration.
If you skipped DLT and your Twilio outbound is failing or rate-limited: that's the cause. ThinnestAI doesn't fix the Twilio registration problem, but it ensures your AI agent doesn't make calls without DLT-approved templates.
Cost example — 25k outbound calls/month on Twilio India trunk
| Cost line | Twilio Voice Intelligence | ThinnestAI on Twilio |
|---|---|---|
| Twilio trunk (outbound) | ₹1.2L | ₹1.2L |
| Voice Intelligence platform | $10,000 (~₹8.4L) | — |
| ThinnestAI platform fee | — | ₹1.5L |
| STT/LLM/TTS BYOK | ₹2.5L | ₹2.5L |
| Monthly total | ~₹12.1L | ~₹5.2L |
Savings: ₹6.9L/month (~57%). Same Twilio trunk, same numbers, same outbound capacity.
FAQ
Can I keep my existing Twilio India numbers and SIP trunk?
Yes — that's the design. ThinnestAI sits on top; you keep your trunk, your numbers, your DLT registration, your Twilio bill. We charge only the ₹1.5/min platform fee for orchestrating the agent.
Does ThinnestAI replace Twilio Studio flows entirely?
Yes for AI-driven conversational flows. Twilio Studio still works for non-AI logic (DTMF menus, SMS routing). Many teams keep both — Studio for the dial-plan, ThinnestAI for the conversational agent.
What about Twilio Flex (contact center) integration?
Yes — ThinnestAI agent transfers to Flex queues via SIP redirect. Agent handles tier-1; complex calls escalate to your Flex human queue with full transcript context.
Does ThinnestAI work with Twilio Verify / Lookup?
Yes — agent tools can call any Twilio API. Common pattern: Lookup to validate phone number before dispatch; Verify for OTP flows during the conversation.
Latency over Twilio trunk vs Twilio Voice Intelligence?
Comparable. Both route through Twilio Media Gateways. The ThinnestAI agent processes (STT/LLM/TTS) sits on our side; the trunk-side latency is identical.
What if my Twilio is US-based, not Twilio India?
Works the same way. Your callers will get a US caller ID, which often results in lower connect rates for Indian customers (they ignore unknown international numbers). For better connect rates, register a Twilio India number and DLT-comply it.
Cost of moving from Twilio Voice Intelligence to ThinnestAI?
Migration: 2-3 working days. Twilio Voice Intelligence is $0.10/min platform; ThinnestAI is ₹1.5/min (~$0.018) — 5× cheaper for equivalent functionality. Same trunk; only the agent layer changes.
Combined SLA — Twilio's + ThinnestAI's?
Twilio commits 99.95% on Programmable Voice. ThinnestAI commits 99.9% on the platform. Combined effective uptime ≈ 99.85%. Twilio outages (rare) affect us; our platform outages (rare) don't affect Twilio. Both have status pages.