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RE: [Sip] RE: Delivering request-URI and parameters to UAS via proxy

"Christer Holmberg" <christer.holmberg@ericsson.com> Tue, 15 January 2008 12:49 UTC

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Subject: RE: [Sip] RE: Delivering request-URI and parameters to UAS via proxy
Date: Tue, 15 Jan 2008 13:49:18 +0100
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From: "Christer Holmberg" <christer.holmberg@ericsson.com>
To: "Elwell, John" <john.elwell@siemens.com>, "Francois Audet" <audet@nortel.com>
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Hi John, 

>>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?

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.

Good point. I guess we could simply say URI. We'll fix that in the next
version of the document.

Regards,

Christer


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