SignalWire is a unified communications platform that lets developers build AI agents and call flows in code, with AI constrained by state machines rather than prompts. It's built on FreeSWITCH's media engine and handles state management, timing, and infrastructure so developers focus on product logic instead of managing event races and timing issues.

• State lives inside the call architecture, eliminating race conditions and scaling from 10 to 10,000 concurrent calls without architectural changes
• AI agents follow developer-defined code logic as state machines where the model only sees exposed tools and data at each step, preventing off-script behavior
• The platform owns the full stack from media engine to carrier layer, giving developers direct control over network behavior instead of wrapping a third-party service