Siphon LogoSIPHON
DocsManifestoBlog
Open-source Calling AI

No markups.
No lock-in.
No middlemen.

Build production-grade AI calling agents on your infrastructure. Full control over data, costs, and AI providers. Zero platform fees.

Star on GitHubGet Started 
1from siphon.agent import Agent
2from siphon.plugins import openai, cartesia, deepgram
3
4# Initialize your AI stack
5llm = openai.LLM()
6tts = cartesia.TTS()
7stt = deepgram.STT()
8
9# Define the worker
10agent = Agent(
11    agent_name="sales-rep",
12    llm=llm,
13    tts=tts,
14    stt=stt,
15    system_instructions="You are a helpful sales representative..."
16)
17
18if __name__ == "__main__":
19    agent.start()

How does Siphon work

The open-source orchestration layer that connects your AI stack to the telephone network, managing state, latency, and interruptions in real-time.

Siphon System Overview
Instant Scaling

Scale Horizontally
with Zero Config

Define your agent logic once. To scale, simply spin up more worker instances on any server. It automatically detects them and balances the load instantly.

Automatic Load Balancing

Traffic is distributed intelligently across all active workers.

Limitless Workers

Run one worker or a thousand. The architecture stays the same.

INBOUND/OUTBOUND TRAFFIC
Siphon Logo
$ start worker
● connected
id: wrk_18x9
Worker 01
$ start worker
● connected
id: wrk_28x9
Worker 02
$ start worker
● connected
id: wrk_38x9
Worker 03

Everything you need for
Production AI Calling

SIPHON isn't just a toy. It's a robust framework designed for building reliable, scalable telephony applications.

Telephony First

Built for the PSTN. It handle SIP signaling, trunking, and phone number management natively.

Real-time Latency

Powered by LiveKit's WebRTC infrastructure for sub-500ms voice-to-voice response times.

Data Persistence

Automatic storage for connection metadata, transcripts, and recordings to your own buckets.

Inbound & Outbound

Handle incoming customer support calls or trigger outbound appointment reminders programmatically.

Privacy & Control

You own the infrastructure. Recordings and keys stay in your environment, not a black box SaaS.

Superior Audio

Advanced VAD (Voice Activity Detection) and interruption handling for natural conversations.

Frequently Asked Questions

Everything you need to know about SIPHON

Yes. SIPHON is 100% open-source under the Apache 2.0 license. You never pay us a platform fee. You only pay for your own infrastructure and the AI/Telephony providers you choose (e.g., OpenAI, Twilio).