Christer, > -----Original Message----- > From: Christer Holmberg [mailto:[EMAIL PROTECTED] > Sent: 15 January 2008 10:41 > To: Elwell, John; Francois Audet > Cc: [email protected]; Paul Kyzivat; DRAGE, Keith (Keith) > Subject: RE: [Sip] RE: Delivering request-URI and parameters > to UAS via proxy > > > Hi John, > > >I guess what still confuses me is, when both Target and P-CPI > >are used, which comes first, i.e., which represents the > >earlier target? When I read the draft, I thought Target was > >earlier. From various clarifying emails I now get the > >impression that Target is later. Can you confirm? > > I am not sure what you mean by "earlier" target. [JRE]Assuming that the target changes as the request progresses downstream, I meant the one that occurs first.
> > Target, if present, always represents the current target. A receiving > entity that receives a request without a Target header has to assume > that the Request-URI represents the current target. When no Target > header is available on the request then the Target is inserted when a > reroute is performed. > > P-CPI is ONLY used to maintain the R-URI which is rewritten by the > contact of the UAS. I.e. by the home proxy which is usually at the end > of a chain of proxies. > > When both Target and P-CPI are used: Target always represents the > current target. P-CPI always represents the AOR received by the home > proxy which may in some cases be the same as the current target but it > may also be the last route (not equal to the current target) taken to > deliver the request. [JRE] I think I am getting there. So the target could be some sort of call centre group, for example, and P-CPI could be the AoR of the selected member of that group. Correct? I am a little concerned about using the term "AoR" in the definition of these AoRs. What about a request targeted at a GRUU? I would imagine the Target and P-CPI would both contain the GRUU, which is not an AoR. John _______________________________________________ Sip mailing list https://www1.ietf.org/mailman/listinfo/sip This list is for NEW development of the core SIP Protocol Use [EMAIL PROTECTED] for questions on current sip Use [EMAIL PROTECTED] for new developments on the application of sip
