Rezeptiona

The problem

A plumber on a roof cannot answer the phone. The caller rings the next plumber, and the job is gone before anyone knew it existed.

1. Customer calls
2. →Nobody free
3. →Calls a competitor

What I built

1. 01A German voice agent that answers the trade business phone at any hour
2. 02Dispatcher questions that turn a call into a job
3. 03Every call lands as a record with transcript, task and next action

Features

• Call inbox

  Every call tagged by what it needs: emergency, callback, appointment.

• Job file

  The caller, the extracted task, and the German transcript.

• Dashboard

  Open callbacks, escalations, and a pending appointment in one place.

• Booked week

  Appointments the agent took from the phone.

The hard part

Turn-taking

Wait for silence and the agent sounds slow. Answer too early and it sounds broken. Speech, model and voice stream over one socket, and a predictive turn detector decides when the caller has actually finished. The same pipeline serves a real phone call and an in-browser test call, so the thing being tested is the thing that ships.

Stack

• Frontend

  • Next.js
  • React
  • TypeScript
  • Tailwind

• Backend

  • Fastify
  • Next.js

• Data

  • Supabase
  • Drizzle
  • PostgreSQL

• Voice

  • Deepgram
  • OpenAI
  • ElevenLabs

• Telephony

  • Telnyx

• Platform

  • Turborepo
  • Inngest
  • Stripe
  • Langfuse
  • Vercel