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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