Build a voice agent with Patter

Patter is an open-source SDK that turns any AI agent into a phone agent. Pick one of three architectures (Realtime, ConvAI, Pipeline), describe the behaviour in a system prompt, and run a local server that connects to your Twilio or Telnyx number — no Patter Cloud, no managed service. The four-line pattern below is the entire surface.

Architecture in one diagram