SIPHON is an open-source framework designed for building AI-powered voice calling agents that operate directly on the user's own infrastructure. The platform is aimed at developers and organizations seeking production-grade telephony applications with full control over data, costs, and choice of AI providers. SIPHON emphasizes eliminating platform fees, vendor lock-in, and intermediaries, allowing users to deploy and scale AI calling solutions without relying on proprietary SaaS offerings.
The tool serves as an orchestration layer that connects an AI stack to the telephone network, managing call state, latency, and interruptions in real time. SIPHON natively supports telephony features such as SIP signaling, trunking, and phone number management, making it suitable for applications that interact with the Public Switched Telephone Network (PSTN). It is built to handle both inbound and outbound calls, enabling use cases like customer support hotlines or automated appointment reminders. The framework is designed for scalability, supporting horizontal scaling by simply adding more worker instances, with automatic load balancing and the ability to run from a single worker to thousands. Real-time voice-to-voice response times are achieved using LiveKit's WebRTC infrastructure, targeting sub-500ms latencies for natural conversational experiences.
SIPHON integrates with AI and telephony providers such as OpenAI, Cartesia, and Deepgram, as shown in its example code. It provides features like advanced voice activity detection, interruption handling, and automatic data persistence for connection metadata, transcripts, and recordings, which are stored in the user's own storage buckets. The platform prioritizes privacy and control, ensuring that all recordings and encryption keys remain within the user's environment.
0 open-source license, with no platform fees charged by its creators. Users are responsible only for the costs associated with their chosen infrastructure and third-party AI or telephony services. SIPHON is maintained by Blackdwarf and is available for deployment from its public repository.
SIPHON sits in PulseGate's Voice, TTS & speech category. It enables developers to build and deploy production-grade AI voice calling agents on their own infrastructure. SIPHON is an open-source project aimed at developers building AI voice agents. The project is open source (Apache-2.0). SIPHON is available on the command line, and it can be self-hosted.
SIPHON first shipped in 2026. The project is developed in the open on GitHub with 47 stars and 11 commits in the last 90 days. Across PulseGate's embedding index, SIPHON has few near neighbours, marking it as relatively distinct. Among its 5 catalogued features are Voice AI agents, open-source framework, and self-hosted.
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