Hi, Lets say Proxy srever gets an invite and it forks the Request( since user is registered at multiple places). I think the forked requests will have the same From,To and call-id header fields. So how do you distinguish them?
Thanks Varun --- "Singh, Indresh (SNL US)" <[EMAIL PROTECTED]> wrote: > > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On > Behalf Of varun > Sent: Wednesday, March 14, 2007 2:19 PM > To: [email protected] > Subject: [Sip-implementors] Sip Registration and > Invite forking > > Hi, > Is contact header mandatory in SIP Registration. > > No > The TO header field being the address of record is > mapped to Contact address in Registrar when a > registration request is received. > In case, contact is optional then how is the mapping > done in Registrar? > > > No mapping is done in this case. A registration > request can be received > to fetch the existing binding information ( It is > called query like new > registeration, refresh, un-register, there is a > query registration when > a REGISTER method is received without any contact > information ) > > > Another question is about Invite forking.How are the > forked Invite requests distinguished from each other > or rather their responses. > > > Forking requests are identified by the > dialog-identifiers ( the from and > to tags ). For the case where there are multiple > bindigns associated > with a DN and the call is forked by proxy/B2BUA, the > call-id/session > identifier remains same, but the dialog-ids ( > from-tag is populated > differently in the initial invite ). > > Now the responding UAS will populate different > to-tag for each forked > INVITE request received by them. But the proxy/B2BUA > based on the > call-id and tags can still figure out which session > these responses are > associated with and in that session which dialog > that response is > associated with. > > > > Thanks > Varun > > > > > ________________________________________________________________________ > ____________ > TV dinner still cooling? > Check out "Tonight's Picks" on Yahoo! TV. > http://tv.yahoo.com/ > _______________________________________________ > Sip-implementors mailing list > [email protected] > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > > > ____________________________________________________________________________________ Looking for earth-friendly autos? Browse Top Cars by "Green Rating" at Yahoo! Autos' Green Center. http://autos.yahoo.com/green_center/ _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
