[sipcore] location-conveyance-03 just submitted

["James M. Polk" <[e-mail]>]

SIPCORE

http://www.ietf.org/internet-drafts/draft-ietf-sipcore-location-conveyance-03.txt

This version is a fairly radical departure from previous versions of 
the (long standing) effort.  This time the doc didn't grow...

We added Jon Peterson as a co-author, and he helped in Anaheim 
propose a significantly less complex way of specifying location 
conveyance for SIP. More than 95% of the doc has been rewritten by 
Jon and I, with a net result of 27 less pages of text (52 to 25 now).

We took out the terms and concepts of following parameters:

- inserter
- inserted-by
- used-for-routing
- host-id
- node-id

as well as limiting the number of locationValues to *ONE*, in a SIP request.

We removed the ability for SIP intermediaries to add location along 
the way unbeknownst to the UAC (with one infrequently used 
exception). In this way, location errors are only end-to-end, so 
there is no need to identify which entity added location to make sure 
the right entity reacted the right way when an error was caused by 
the location they inserted, and not that of another entity's inserted 
location (which is all very confusing).

We added the ability for a SIP intermediary to augment a location 
with what the UAC should send in a subsequent request, and the 
ability to verify this augmentation is present before successfully 
processing that request. This is in line with both RFCs 4479 and 5491.

Comments are appreciated

James