retell-alternative

Open-source, self-hostable platform for building and operating AI phone agents.

The open-source foundation for production Voice AI. Build, scale, and own your AI calling infrastructure. Bridge legacy SIP to modern LLMs over ultra-low latency WebRTC pipelines. Zero platform fees, BYOK, and full data sovereignty.

AI voice agent API — give your agent a phone, pay per call with Bitcoin Lightning. No signup, no subscription. MCP-native. Alternative to Vapi, Retell, Bland.