Fonoster is an open-source alternative to Twilio. A complete telephony stack for building voice applications with SIP, WebRTC, and PSTN connectivity.
Requires Docker runtime or Docker Compose environment.
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Standard Docker Compose deployment
version: '3.8'
services:
fonoster:
image: fonoster:latest
restart: always
ports:
- "8080:8080"Fonoster is a modern self-hosted, privacy-first communication solution. Fonoster is an open-source alternative to Twilio. A complete telephony stack for building voice applications with SIP, WebRTC, and PSTN connectivity. Built for users and teams demanding full data ownership, Fonoster eliminates proprietary vendor lock-in while delivering an intuitive, reliable experience.
These tools share use cases. Features, costs, and deployment needs differ.
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GitHub stats captured Oct 5, 2026.
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