Siphon

Open-source infrastructure for building and self-hosting production voice AI calling systems.

PlatformWebfreeglobal

Siphon is open-source infrastructure for building production voice AI calling agents, bridging SIP telephony to LLMs over low-latency WebRTC in a team's own VPC with zero platform fees. It's aimed at developers who want to own their AI calling stack instead of renting one from managed platforms like Vapi or Retell, keeping full data sovereignty over customer audio and transcripts.

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Problem & pain-point mapping
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What it's a strong alternative to
Trust & credibility signals

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