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FastAPITwilioVapiNext.js 2025
Vozko
AI Voice Receptionist for Restaurants
01
Overview
Vozko is an AI voice receptionist built for restaurants that never miss a call. During dinner rush, when the phone rings and staff are busy serving guests, Vozko answers — handling reservations, menu questions, dietary inquiries, and special requests through a natural sounding AI voice agent. When the AI hits its limit, it escalates to human staff with full conversation context. Built for hospitality businesses that want to answer every call without hiring a dedicated receptionist.
02
The challenge
- Twilio telephony integration with real time audio streaming and transcription latency under 500ms
- Vapi AI voice agent orchestration — managing turn taking, interruptions, and natural conversation flow
- Restaurant menu ingestion and structured query resolution across dietary, pricing, and availability domains
- Seamless human escalation with full conversation context handoff, no repetition for the caller
03
What shipped
- AI voice agent handles phone reservations and menu queries 24/7 with natural conversational flow
- Natural escalation to human staff when AI cannot handle a request, with full context transfer
- Twilio powered telephony with real time transcription, sentiment analysis, and call recording
- Dashboard for managing reservations, call logs, AI performance analytics, and no show tracking
- Google Calendar sync — bookings appear instantly, changes flow both ways, no double bookings
- Average reservation completed in 18 seconds — party size, time, special requests handled naturally
04
Product
05
Stack
- Next.js frontend with Tailwind CSS for the management dashboard and analytics
- FastAPI backend handling Twilio webhooks, Vapi voice agent orchestration, and REST endpoints
- Twilio for PSTN telephony, SIP trunking, and SMS/WhatsApp notifications
- Vapi AI for voice agent natural language processing and speech synthesis
- PostgreSQL for reservation data, call logs, and restaurant configuration
- Google Calendar API for bidirectional booking sync