softphone supporting RFC 3312

Hello, I'm looking for a softphone supporting RFC 3312. what I need is the negotiation of the codec (audio and/or video) used in a session. The softphones involved should negotiate using "Invite" and "183 Session Progress" and the called phone should ring only after some preconditions are met. Does anyone know if such a softphone exists? (it would be better if it's opensource) Regards Luca

Reply to
Loading thread data ... Forums website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.