Re: [Sip] a question about IETF draft location conveyance 09

Daniel

wow... you nailed this one quickly.

Neither the SIP WG nor Geopriv WG have a position with regard to 
this.  I don't like the parameter at all, and have said so from its 
introduction into discussions about putting it in the draft.  I don't 
think it accomplishes much more than confusion or a false sense of 
security by implementors.

That said, a proxy has "ar" capabilities wrt the Geolocation 
according to Table 1. (on page 7), and associated text states this 
pretty clearly. There is no text (not even a hint) that a proxy 
cannot read a location because "recipient=endpoint", therefore it 
can.  I would take this "recipient=" parameter as a hint to each type 
of SIP entity that

         + if a UAS receives this parameter (meaning in a SIP request with
            a Geolocation header), and it is set to "recipient", the UAS
            shouldn't ignore the location in the request (like it otherwise
            might).

         + If a proxy receives this parameter (meaning in a SIP request with
            a Geolocation header), and it is set to "server", the proxy
            shouldn't ignore the location in the request (like it otherwise
            might).

I don't think either indication *ever* means the other SIP entity 
type cannot view the location, based on the parameter.  The only 
exception I can think of is a Location-by-value hidden by S/MIME 
means no one save who has the decryption key can view the contents of 
what's encrypted.

Does this make sense?

James

At 04:59 AM 11/20/2007, Daniel Grotti wrote:
>Hi all,
>I'd like to ask a question about "draft-ietf-sip-location-conveyance-09.txt".
>
>How does Proxy Server have to work when a Geolocation Header contain 
>"recipient=endpoint" parameter ?
>Does the Proxy server just have to forward the SIP message (without 
>do anything else) or can it read the information conveyed ?
>thanks,
>Regards
>daniel
>
>--
>
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>Daniel Grotti
>DEIS - University of Bologna
>Via Venezia, 52 - 47023 Cesena (FC) - ITALY
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_______________________________________________
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Use sipping@ietf.org for new developments on the application of sip