AFAIK it uses Sofia SIP library and this is the link to the library itself implemented stuffsQ1 – I have looked on the wiki and was unable to find a list of RFC’s that FS is intended to comply with.
The page http://wiki.freeswitch.org/wiki/Specsheet#Protocols has a list of SIP protocols by name but these have no RFC number against them.
Have I just missed the page?, if not is there any plan to put such a page together?
Is there a SIP compliance matrix ?