Use the Vobiz network
Indian numbers, termination and routing across multiple Indian carriers from one account. The fastest path from signup to a live call.
SIP TRUNKINGSIP trunking in India for AI voice agents
Vobiz is a SIP trunk provider in India for AI voice agents, PBXs and contact centers. Bring your own carrier, use ours, or run both. INR billing, KYC built into signup, and 140 and 1600-series numbers on Indian carriers, all configured by API.
Works with Vapi, Retell AI, Bolna, LiveKit, ElevenLabs, OpenAI Realtime and 3CX.
Talk to an engineercURLBASH
1# Create a trunk: returns trunk_id and its SIP domain2curl -X POST https://api.vobiz.ai/api/v1/Account/$AUTH_ID/trunks \3 -H "X-Auth-ID: $AUTH_ID" -H "X-Auth-Token: $AUTH_TOKEN" \4 -H "Content-Type: application/json" \5 -d '{"name":"voice-agent-prod","trunk_type":"OUTBOUND","max_concurrent_calls":50}'
POST /trunks201 Created
{ "trunk_id": "aabbccdd-1234-…", "trunk_domain": "aabbccdd-1234-….sip.vobiz.ai"}10min
to first call
Sub-80ms
one-way latency
43
fields on every call record
15M+
calls a day
How it works
From signup to a live SIP trunk
in India in five steps
No ticket, no provisioning window. Everything below is available in the console or over the REST API.
Signup12345Live SIP trunk01Complete KYCConsole
PAN
Verified
VerifiedGSTVerified
VerifiedCINVerified
VerifiedAadhaarvia DigiLockerVerified
Verified02Create a trunkPOST /trunksBASH
1# Create a trunk: returns trunk_id and its SIP domain2curl -X POST https://api.vobiz.ai/api/v1/Account/$AUTH_ID/trunks \3 -H "X-Auth-ID: $AUTH_ID" -H "X-Auth-Token: $AUTH_TOKEN" \4 -H "Content-Type: application/json" \5 -d '{"name":"voice-agent-prod","trunk_type":"OUTBOUND","max_concurrent_calls":50}'Response 201 Created{ "trunk_id": "aabbccdd-1234-…", "trunk_domain": "aabbccdd-1234-….sip.vobiz.ai", "trunk_status": "active", "concurrent_calls_limit": 50}
Built for voice AI
Low-latency SIP trunking for real-time voice AI
A conversational turn has roughly 500ms end to end before a pause feels unnatural, and it has to cover speech-to-text, the model, text-to-speech and the network.
On Vobiz, media crosses exactly one internal relay, in India for calls in India.
Shown at 1/8 speed
Carrier / BYOCPSTN · SIP
Media Engine1 HOPYour agentSTT · LLM · TTS
Carrier / BYOCPSTN · SIPMedia Engine1 HOPYour agentSTT · LLM · TTSConversational turn500ms
NetworkSpeech-to-text · model · text-to-speechNetworkPause feels unnatural
0100200300400500 ms
- One-way latency
- Sub-80ms
- Speech onset
- 50ms
- PESQ MOS
- 4.2+
- Signal-to-noise
- 38.4dB
Vobiz internal measurements.How the single-hop architecture works
Your carrier, ours, or both
Keep your Airtel, Jio or Tata trunk, or use ours
Vobiz works as your only route, a second route, or the layer your existing carrier plugs into.
Bring your own carrier (BYOC)
Keep your existing PRI or SIP trunk contract and rates.
See a BYOC setup
Run both side by side
Start Vobiz as a second route. Shift traffic gradually with priority and weight, and keep your existing route as fallback while you compare.
Vobiz
On-prem interconnect
Connect Vobiz directly to the PBX, SBC or contact center you run on your own premises.
Routing and failover
Configurable SIP trunk failover
On the Vobiz network, calls fall back across multiple carriers automatically, per leg, while the call is being set up.
voice-agent-prodOrigination URIs
Origination URIPriorityShare of calls
URI A167%
If priority 1 fails
If priority 1 failsURI B233%
Higher priority URI is tried first; if it fails, the next one takes the call. URIs at the same priority split traffic by weight, so a URI at 20 carries twice the calls of one at 10.
Security and access control
Control exactly who can call through each SIP trunk
Digest credentials
— username and password auth for AI agents, softphones and anything behind NAT. Passwords are write-only and never returned by the API.
Digest
username••••••••
passwordwrite-only
IP and CIDR allowlists
— accept traffic only from your SBC, PBX or carrier ranges.
SBC
PBX
carrier ranges
Both at once
— require an allowlisted IP and valid credentials for defense in depth.
allowlisted IP
valid credentials
Tenant isolation with per-customer KYC
— Ask each end customer to complete their own KYC, so platforms serving many businesses stay compliant per customer.
Sub-account Acredentials
KYC
KYCSub-account Bcredentials
KYC
KYCSub-account Ccredentials
KYC
KYCIntegrations
A SIP trunk for Vapi, Retell AI, Bolna and every platform you run
Connect over standard SIP. Nothing on the platform side changes. Keep the orchestration you chose and bring the carrier underneath it.
See all integrationsPlatformHow it connectsSetup guide
SIP trunk, inbound and outbound
SIP trunk
WebSocket audio streams, not SIPIndia compliance
SIP trunking in India, with DoT and TRAI compliance handled
Business VoIP in India runs on licensing, KYC and registered calling. Vobiz builds each into the account, so you don't run them separately.
DoT and TRAI compliance
KYC per account and per sub-account
— verification runs in the console at signup, and again for each end customer where you need it.
140
140 series for promotional calls
— DLT-registered, with NDNC scrubbing and calling limited to 9 AM–9 PM.
1600
1600 series for service calls
— the TRAI-designated series for service and transactional calls from regulated entities such as banks, NBFCs and insurers.
Observability
Know whether a bad call was the trunk, the carrier or the model
Every call detail record carries 43 fields — MOS, jitter, packet loss, negotiated codec, which side hung up and why. Fetch by call_id, filter per sub-account, or export to CSV. Trunk webhooks report each call’s start and hangup, including billed seconds and MOS.
Trunk webhooks
- CallInitiated
- Negotiated codec
- MOSJitterPacket loss
- Which side hung upWhy they hung up
- Hangup"Billsec"3"MOS"4.5
Call detail record43 fieldsGET/api/v1/Account/{auth_id}/cdr/{call_id}
{ "data": { "mos": 4.5, "jitter": 0, "packet_loss": 0, "codec": "PCMU", "hangup_source": "Caller", "hangup_cause": "NORMAL_CLEARING", … }}⚲ Fetch by
call_id▽ Filter per sub-account↓ Export to CSVRelated
Get started
Your first SIP trunk
in 10 minutes
Create a trunk, point your agent at it, place a call.
No ticket, no sales call, no commitment.
FAQ
SIP trunking questions
- A SIP trunk carries voice calls between your own software and the public phone network over the internet, in place of physical phone lines. You point your platform at a SIP address and calls flow both ways.
- Yes, when it runs through a licensed operator under DoT and TRAI rules. Vobiz carries that licensing, so you don't need a telecom licence of your own; you complete KYC on your account instead.
- PAN, GST, CIN or Aadhaar via DigiLocker, depending on your business type. Verification runs in the console at signup, and again for each end customer's sub-account where you need it.
- Calling is billed per minute in INR, at a flat ₹0.65 a minute for both inbound and outbound, with enterprise pricing above about 50,000 minutes a month. There is no setup fee and no ticket; you pay for the minutes you use.
- Yes. 140-series numbers are for promotional calls, DLT-registered with NDNC scrubbing and a 9 AM–9 PM calling window. 1600-series numbers are TRAI's series for service and transactional calls from regulated entities such as banks, NBFCs and insurers. Either routes to a trunk like any other DID.
- Yes, over standard SIP — nothing on the platform side changes. Assign an Indian number to the trunk and point the platform at it; each platform has its own setup guide, linked in the integrations table above.
- Yes. Bring your own carrier and keep your existing contract and rates, run Vobiz alongside it as a second route with priority and weight, or connect Vobiz directly to the PBX, SBC or contact center on your premises.
- A PRI is a physical circuit with a fixed number of channels, installed per site. A SIP trunk runs over the internet: capacity is a setting rather than hardware, one trunk serves many numbers, and you configure it by API instead of waiting on an installation.
- Not as a port-in today. Keep the number with your current carrier and bring that carrier's trunk to Vobiz instead, so calls on the existing number run through the same setup as your Vobiz numbers.
- You set a maximum when you create the trunk and can change it later. Calls-per-second limits sit alongside it as flood protection on new call attempts.
- Registered calling is what keeps them clear: promotional calls go out on DLT-registered 140-series numbers with NDNC scrubbing inside the permitted hours, and service calls on the 1600 series. On BYOC routes, number reputation stays with your own carrier.
- Yes. Pricing and billing are in INR, and billing is GST-ready, so invoices carry the GST details your finance team needs.
