For one, it could be used by downstream transaction statefull servers trying to figure out whether a request is or not a retransmission, using the magic cookie in the branch parameter to establish the matching criteria.
WL. On 10/8/06, Manish Jain <[EMAIL PROTECTED]> wrote: > > Hello Friends, > > I believe that branch parameter is used to identify > transaction until dialog is created. Once dialog is > created callid, from-tag and to-tag is used to > identify the dialog. > > branch param is mainly used by proxies to identify > transactions in case of parallel forking. > > I can't understand why a UAC(phone) will need to send > branch parameter in first originating request. Please > throw some light. > > Best Regards, > Manish Jain > > __________________________________________________ > Do You Yahoo!? > Tired of spam? Yahoo! Mail has the best spam protection around > http://mail.yahoo.com > _______________________________________________ > Sip-implementors mailing list > [email protected] > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
