SIP Location Conveyance: dereferencing location-by-reference

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.

Brian and James


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