SIP stack in GO

This SIP stack for RFC:

https://datatracker.ietf.org/doc/html/rfc3261

Stack:

• Encoding/Decoding with Parser optimized for fast parsing
• Transport Layer and support for different protocols
• Transaction Layer with transaction sessions managing and state machine

Parser

Parser by default parses set of headers that are mostly present in messages. From,To,Via,Cseq,Content-Type,Content-Length... This headers are accessible via fast reference msg.Via(), msg.From()...

This can be configured using WithHeadersParsers and reducing this to increase performance. SIP stack in case needed will use fast reference and lazy parsing.