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SIP.NET is SIP stack .NET library written in C#. SIP messageparser realized on Deterministic Finite-state Machine (DFA parse all SIP message for one pass). DFA generates automatically from Augmented Backus–Naur Form from RFC3261.
nSIP is an RFC 3261 compliant implementation of SIP (Session Initiation Protocol) for .NET, written in C#. nSDP is an RFC 4566 compliant SDP parser also in C#, and can be used to make payloads to nSIP messages or to parse any SDP message.