I think that in a closed environment like IMS where all proxies can be guaranteed to support loose routing, there is effectively almost no difference between P-Called-Party-ID and Target header.
One case where also in IMS the Target and the P-Called-Party-ID would contain different values is for example when you call a freephone address of a certain user, where the freephone uri is a service identity on an AS. The freephone service would reroute the request to the actual user [EMAIL PROTECTED] The user may want to know that he was called through a freephone number in this case: P-Called-Party-ID: [EMAIL PROTECTED] Target: [EMAIL PROTECTED] /Hans Erik -----Original Message----- From: Francois Audet [mailto:[EMAIL PROTECTED] Sent: Thursday, April 03, 2008 11:03 PM To: Christer Holmberg; Hans Erik van Elburg; Juha Heinanen Cc: sip@ietf.org; DOLLY, MARTIN C, ATTLABS Subject: RE: [Sip] Comparison of retargeting proposals So what is the P-Called-Party-ID used for? I'm trying to figure out the different use cases for P-Called-Party-ID versus Target. > -----Original Message----- > From: Christer Holmberg [mailto:[EMAIL PROTECTED] > Sent: Thursday, April 03, 2008 13:48 > To: Audet, Francois (SC100:3055); Hans Erik van Elburg; Juha Heinanen > Cc: sip@ietf.org; DOLLY, MARTIN C, ATTLABS > Subject: RE: [Sip] Comparison of retargeting proposals > > > Hi, > > The P-Called-Party-ID is only inserted by the registrar of the UAS, > while the Target can be inserted also by other entities. _______________________________________________ Sip mailing list https://www.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