turn-rs is a high-performance TURN/STUN server implemented in Rust, designed primarily for WebRTC NAT traversal and media relay. The codebase consists of a core library (`turn-server`) and a companion SDK crate (`turn-server-sdk`) that provides a gRPC client and hooks API. The server architecture is async I/O driven (Tokio) with optional transport modules for UDP and TCP (including TLS via rustls). Protocol handling is implemented from scratch with a STUN/TURN message codec, a connection-less switch mechanism for relaying packets between sessions, and a memory pool for zero-copy buffering. Management and observability are exposed through an optional gRPC API (sessions, statistics, destroy) and a Prometheus metrics endpoint. Authentication supports static credentials, TURN REST shared-secret, and an external gRPC hook service for dynamic password lookup and event callbacks. The project is well-tested with unit tests, property-based fuzzing (proptest), integration tests using coturn's test client, and benchmarks. It is actively maintained with recent releases and comprehensive documentation.