Re: [Sip] Comparison of retargeting proposals

[Paul Kyzivat <pkyzivat at cisco.com>]

Francois,

IMS has the notion of implicit registration, so when you register for 
AOR1 you may implicitly be registered for AOR2 and AOR3 as well. (Using 
the same Contact URI.)

So, when you subsequently receive an incoming request at your Contact 
URI, you can't tell from the Contact address which of the AORs was the 
target of the request. The P-Called-Party-ID allows you to figure that 
out, and therefore light up the proper line, or whatever, on your phone.

	Paul

Francois Audet wrote:
> 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:christer.holmberg at ericsson.com] 
>> Sent: Thursday, April 03, 2008 13:48
>> To: Audet, Francois (SC100:3055); Hans Erik van Elburg; Juha Heinanen
>> Cc: sip at 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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