Open-source voice-AI SDK. The Vapi/Retell alternative for builders who want to own the stack. Give your AI agent a phone number in 4 lines — Python and TypeScript, MIT licensed, Twilio + Telnyx.

AI Phone Agent: A starter kit to build AI agents that answer real phone calls and talk to customers in real time (OpenAI Realtime). Node.js backend for Twilio & Amazon Connect - ship phone-first voice agents faster. Dial +1 (855) 522-2348 to try the demo.

A reference integration between Teler and OpenAI Realtime API, based on Media Streaming over WebSockets.

Open-source voice AI platform for SMB service businesses — automate inbound calls, appointment scheduling, and customer support with AI phone agents. API-first, multi-tenant, with full observability.

ACL 2026 Demo: Real-time bidirectional Korean-English speech translation over PSTN telephone calls. Server-side relay with dual-session echo gating. 555ms median latency, USD 0.28/min.

A reference integration between Teler and Gemini Live API, based on Media Streaming over WebSockets.

Open source AI voice calling agent for Twilio phone calls, built with FastAPI, Google ADK, and Gemini Live API

A reference integration between Teler and Ultravox, based on Media Streaming over WebSockets.

A reference Node integration between Teler and Deepgram, based on Media Streaming over WebSockets.

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.

A reference Node integration between Teler and Ultravox, based on Media Streaming over WebSockets.

A reference integration between Teler and Deepgram, based on Media Streaming over WebSockets.

AI phone assistant template: Twilio voice + OpenAI Realtime API on Cloudflare Workers. Clone, deploy, take calls.

Reference Node integration for Teler and OpenAI using WebSocket-based media streaming.

BRAHM AI Agents — multilingual AI phone agents, dashboard, leads, conversations, billing and integrations platform.