
The dev-first infrastructure for real-time Calling AI. Built with LiveKit for sub-500ms latency. Swap plugins instantly. Stop paying "wrapper" taxes.
Building a voice agent today usually means choosing between two bad options:
The Wrapper Tax: Paying platforms like Vapi or Retell ~$0.08/min to wrap OpenAI models you could access for pennies. You rent their latency, their limits, and their black box.
The Nightmare Build: Stitching together SIP trunks, WebSocket servers, and interruption handling logic before you write a single line of conversation code.
Siphon is the third option. It is the open-source infrastructure layer that gives you the ease of a managed service with the economics of a DIY solution.
💸 Zero Platform Fees: You pay your providers (OpenAI, Deepgram, Twilio) directly. We don't charge a "per-minute markup." Your costs drop by ~90% compared to managed SaaS.
🏎️ Low Latency: Built on LiveKit (WebRTC), Siphon eliminates the lag typical of SIP-based wrappers. The conversation feels instant and human.
🐍 Python Native: No drag-and-drop constraints. Write your agent logic in pure Python. Manage state, context, and function calling with the tools you already know.
📈 Horizontal Scaling: Siphon's worker architecture scales from 1 call to 1,000+ concurrent sessions automatically. Just add more nodes; the system handles the load balancing with zero config.
Managed SaaS (Vapi/Retell): ~$0.08 per min = $800 / month
Siphon (Direct Cost): ~$0.01 per min = $100 / month
Don't build your business on rented land.
(https://github.com/blackdwarftech/siphon)
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