Hello,

For example, OMA specifically recommends the use of parameter in Service 
URI for Presence Lists. Here is the quote from 
"OMA-WP-PRS_1_1_Implementation_Guidelines", Para 5.5.1:

-----
It is RECOMMENDED that:
· the Service-URI-Template for Presence Lists have the following structure:
<xui>;pres-list=<id>
where the <xui> and <id> substitution tags are described in [XDM_Core] 
"Provisioned XDMC Parameters".

The reasons for the recommendation include:
· effective use of resources (e.g. access network bandwidth), since the 
recommended Service-URI-Template makes it
easier for the XDMC to generate a globally unique Service URI that is 
accepted by the RLS XDMS; and
· simplification for the SIP/IP Core network to recognize the Service 
URI as a Presence List (e.g. to optimize routing
of Presence List subscriptions).

An example of a Service URI conforming to the recommended 
Service-URI-Template is as follows:
sip:[email protected];pres-list=list-a
-----

If the RLS server don't want parameters, it can use the Service Uri 
negotiation with a 409 response containing the desired Uri to use.

Regards, Laurent Etiemble.

Dale Worley wrote:
> On Mon, 2008-12-15 at 18:06 +0200, Anca Vamanu wrote:
>   
>> It is not clear from here what part of the R-URI identifies the target 
>> and whether parameters should also be used.
>>     
>
> You are correct -- none of the RFCs specify rigidly how the request-URI
> identifies the "resource" in question.  Part of the overall system
> design is deciding on how request-URIs are mapped into the actual
> resources of the UASs.
>
> Dale
>
>
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