fonoster/fonoster

Health v2 · maintenance only

Adoption not part of the score

8080 stars · 548 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

Fonoster is an open-source programmable telecommunications stack (a Twilio alternative) for building voice and messaging applications, with multitenancy, OAuth2/JWT auth, RBAC, and a Node.js SDK. It supports voice verbs like Answer, Say, Gather, Dial, and Record, plus speech APIs from Google, Deepgram, and ElevenLabs, and can be self-hosted on Kubernetes.

Use cases

• build an IVR without Twilio
• self-host a programmable voice platform
• make outbound calls from an API
• add text-to-speech and speech recognition to phone calls
• record and transcribe calls
• create a cloud PBX for my business
• build a voice AI agent that answers phone calls
• stream audio to and from a caller over WebRTC

When to choose

• you want Twilio-like programmable voice without per-minute vendor lock-in
• you need to self-host your telephony infrastructure
• you're building voice AI agents, IVRs, or call recording workflows in Node.js or TypeScript

When to avoid

• you only need simple SMS messaging with no voice features
• you can't operate your own SIP trunks or Kubernetes infrastructure
• you need a fully managed service with guaranteed SLAs today

Facets

service · maturity active

api-framework sdk speech-recognition tts cli auth self-hosted cloud-computing apis developer-tools speech-processing self-hosted self-hosted cli cross-platform twilio-alternative voip webrtc programmable-voice cpaas ucaas ivr voice-ai pbx telephony-api telephony nodejs kubernetes docker web-server

Member repositories

For agents

markdown · JSON · MCP: product_card(name="fonoster/fonoster")