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

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luca
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