Hi, 

        In draft-rosenberg-sip-unify-00.txt, section 5.5, Figure 11,
        Manyfolks basic call. It mentioned that "The INVITE has a 
        Require header to indicate tht the UAS has to support preconditins"

        What is preconditions extention looks like?

        Just like "100rel" optional tag in the Require header 
        means support PRACK,

        Can we do something like:
        Require: preconditon

        Is this right?


        Thanks in advanced,


        Regards,

        Helen Luo
        Santera System,
        [EMAIL PROTECTED]
        972-461-6330
         
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