SIPSorcery is a comprehensive real-time communications library for .NET implementing SIP, WebRTC, RTP/RTCP, STUN/TURN/ICE, DTLS-SRTP, and SCTP protocols from scratch. The core library (src/SIPSorcery) provides SIPTransport for signaling, RTCPeerConnection for WebRTC, RTPSession for media transport, and media endpoint abstractions (IAudioSink, IVideoSource) for decoupling capture and rendering. Satellite projects include SIPSorceryMedia.Abstractions (media interfaces), SIPSorceryMedia.FFmpeg and SIPSorceryMedia.Windows (codec backends), SIPSorcery.VP8 (a C# port of libvpx VP8), SIPSorcery.OpenAI.Realtime (OpenAI Realtime API client), and a CLI tool (SIPSorcery.Cli) with route/bridge commands for wiring media pipelines between SIP, WebRTC, and cloud realtime endpoints.