Most tutorials about AI voice calling assume you already know telephony. They throw terms like SIP trunking, RTP streams, codec negotiation, and DTMF detection at you before you've even written a line of code.

This isn't that tutorial.

In 10 minutes, you'll have a real AI voice call running — a bot that picks up, talks back with synthesized speech, and hangs up cleanly. No telephony background required.

What You're Building

A simple flow:

You trigger an outbound call via a REST API

VoIPBin connects the call and hits your webhook

Your webhook returns instructions: "speak this text, then wait for input"

VoIPBin handles all the audio — STT, TTS, RTP — and sends transcriptions back to you

You respond with the next action

Your code never touches audio.…