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.
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