Re: [Geopriv] SIP Location Conveyance: dereferencing location-by-reference

Brian Rosen wrote:
> In sip-location-conveyance, we allow a URI in the Location header to provide
> for location-by-reference.  We must have some kind of text that says what
> the recipient does with this URI.
> 
> Our proposal is to change the ABNF, which currently allows this URI to be
> AbsoluteURI (meaning any scheme) and replace it with HTTP/HTTPS only.  Of
> course, there would still be the cid: for message body identification.  We
> would then define a dereference process as doing an HTTP/HTTPS GET, with no
> parameters, on the URI, and expect to receive in return a PIDF-LO, exactly
> as it would appear in a body.  The text would state MUST implement TLS,
> except for the emergency case.  The text would further state that additional
> dereferencing procedures could be defined by a standards track RFC.

I'm not sure it is as simple as this.

What happens when a client gets a subscribable location reference URI 
via the L7-LCP, and puts that into a Location header in an INVITE?  How 
is the subscription done with HTTP?

-andy


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