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Architecting Ultra-Low Latency Voice AI in India: The Vobiz x Vapi Integration

A comprehensive technical guide on connecting Vapi's Voice AI orchestration platform with Vobiz's SIP trunking to deploy zero-latency conversational agents directly on Indian phone numbers.

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PIYUSH SAHOO

26 March 2026

Vobiz — AI-First Telecom Infrastructure for Voice Agents

SIP trunk, voice API, and programmable telephony for voice AI. Sub-80ms latency, global DIDs, WebRTC, and native integrations for Vapi, Retell AI, ElevenLabs, LiveKit, Pipecat, and OpenAI Realtime.

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Products

Voice API — Programmable call control, REST and XML, real-time webhooks.
SIP Trunking — Carrier-grade SIP trunking, instant provisioning, inbound and outbound.
Number Provisioning (Global DIDs) — Local, national, and toll-free numbers in 130+ countries.
Phone Numbers (India) — TRAI-compliant local and mobile numbers with KYC.
WhatsApp Business API — Messaging and voice calls over WhatsApp.
Predictive Dialer — Auto-dialing with answer/voicemail detection.
Campaign Manager — Outbound voice campaign scheduling and retry logic.