Building AI calling agents shouldn't require a commercial license or massive per-minute markups. If you are a Python developer, you should be able to spin up a sub-500ms latency voice agent on your own machine. Today, I'm going to introduce you to Siphon, an open-source (Apache 2.0) Python framework built by BLACKDWARF that natively bridges SIP trunks to LLMs. Prerequisites Python 3.10+ A Twilio or Telnyx SIP Trunk LiveKit Credentials An OpenAI API Key Step 1: Installation & Setup First, clone the Siphon repository and install the requirements. pip install siphon-ai Enter fullscreen mode Exit fullscreen mode Next, create a .env file in your project root to hold your raw provider keys. Because Siphon is self-hosted, you pay providers like OpenAI and LiveKit directly—NO MIDDLEMAN FEES.…