Your carrier
A licensed Indian telecom provider gives you the SIP trunk, the phone numbers and the per-minute tariff. You pay them directly.
Guide · BYOC
SIP trunk for voice AI in India: bring your own carrier
Voice AI platforms such as Vapi can work with a SIP trunk you bring, known as BYOC (bring your own carrier). In India the trunk and numbers must come from a licensed telecom provider. This guide covers what to buy, how calls reach the AI, and what to agree before the first call.
The basics
What BYOC means for a voice AI agent
With BYOC you keep the telecom contract. The AI platform does not sell you minutes; it connects to your trunk and handles the conversation.
The orchestration layer
Software that terminates the SIP calls, streams audio to speech recognition and the AI model, plays the reply and records the call.
The AI agent
The conversation itself: understanding the caller, deciding what to do, calling your systems and handing over to a person when needed.
Step by step
Connecting a SIP trunk to voice AI in India
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Get a trunk from a licensed provider
Ask for a SIP trunk with the channel count you need for concurrent calls, and numbers for inbound and outbound calling. Agree how the trunk is delivered: over the internet with authentication, or a dedicated link to your cloud.
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Point the trunk at the orchestration layer
Inbound calls are routed to the SIP endpoint of the voice platform; outbound calls are placed through the trunk. Allow-listed IPs, codecs and caller ID are agreed with the provider.
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Agree the rules, test, then scale
Commercial calls in India fall under TRAI's rules on consent, Do Not Disturb preferences and calling numbers. Settle these with your provider and your compliance team before the first campaign. Then run test calls for audio quality and latency on real mobile networks, and raise concurrency as the trunk allows.
SpinifyAI BYOC Voice API
Your trunk, our orchestration, your infrastructure
We do not sell or resell telecom minutes. Our BYOC Voice API connects to your SIP trunks and direct interconnects, routes and streams the audio in real time, records calls and lets you plug in speech engines. You pay your telco exactly what your minutes cost.
Prefer a ready-made agent? VocalMitra speaks Hindi, Tamil, Telugu, Marathi, Bengali and English.
No telecom markup
Direct carrier pricing.
Low latency
Real-time audio routing and streaming.
Data stays with you
Runs in your infrastructure where required.
Developer APIs
Calls, live streams, recordings, webhooks.
Does SpinifyAI sell SIP trunks?
No. Trunks and numbers come from your licensed telecom provider, billed at their tariff. We provide the software that connects them to voice AI, and can suggest providers on request.
Can I use my existing SIP trunk with an AI voice agent?
Usually yes, if the provider can route calls to an external SIP endpoint and allows the concurrency you need. Check the channel count, codecs and how the trunk is delivered.
Why bring your own carrier instead of buying minutes from the AI platform?
You keep your existing telecom contracts and pricing, your numbers stay yours, and the arrangement fits data-localisation and compliance requirements more easily.
Can the AI talk on our website instead of the phone?
Yes. Web and app conversations run over WebRTC and need no SIP trunk or telecom charge.
Bring your SIP trunk
Talk to our engineers about connecting your carrier to voice AI.