fonoster is a cloud-native, self-hosted alternative to Twilio for building programmable voice applications, SIP trunks, and WebRTC call flows. It provides a unified JavaScript/TypeScript SDK and CLI for routing calls, managing virtual numbers, and connecting conversational voice AI agents.
$ npm install @fonoster/sdk
import { VoiceServer } from '@fonoster/voice';
new VoiceServer().listen(async (req, res) => {
console.log(`Incoming call from ${req.callerNumber} to ${req.ingressNumber}`);
await res.answer();
await res.say('Welcome to the automated engineering dispatch line.');
const speech = await res.gather({ source: 'SPEECH', timeout: 4000 });
await res.say(`Routing your request for: ${speech}`);
await res.hangup();
});Repository: https://github.com/bhubbard/fonoster
Live Studio: https://code.brandonhubbard.com/fonoster/
Portal: https://code.brandonhubbard.com/
Install: npm install @fonoster/sdk
Design System: Brandon Hubbard Swiss Modernist (#0A0A0C / 1px Exposed Structural Grid)