Alex Migolin developed and enhanced SIP integration features across the LiveKit ecosystem, focusing on configurable caller identification and robust protocol handling. Working primarily in Go and TypeScript, Alex upgraded the livekit/protocol and livekit/sip repositories to support display name configuration and RFC-compliant URI validation, improving interoperability and developer experience. In livekit-cli, Alex introduced custom SIP header support and replay workflow enhancements, enabling granular control over SIP call initiation. Dependency management and protocol upgrades were handled with care to ensure compatibility and runtime efficiency. Alex’s work demonstrated depth in backend and network programming, delivering reliable, testable solutions for SIP-centric communication workflows.