[Sip] Updated route construct specification

[Jonathan Rosenberg <jdrosen at cisco.com>]

I've updated this document. It is (once again) almost completely 
rewritten. Until it appears in the archives, you can pick it up at:

http://www.jdrosen.net/papers/draft-rosenberg-sip-route-construct-02.txt

Basically, it proposes to turn Service-Route into the inverse of Path, 
so that Service-Route/Path work more like record-routing. This is now 
specified in a way which is backwards compatible with IMS, which was an 
issue for the previous spec. I believe this makes service-route usable 
for the internet at large, and it is a key part of solving the 
sip-outbound mid-dialog failover problem. Its also WAY simpler than 
previous versions. The whole bit in there about redirections overriding 
route sets is now folded into the more general UA loose routing document 
I also published.

Just to get some controversy thrown in there, the draft also specifies 
as part of its behavior that a UA register only a single contact at a 
time, and only that contact get reflected in the REGISTER response.

Thanks,
Jonathan R.
--
Jonathan D. Rosenberg, Ph.D.                   600 Lanidex Plaza
Cisco Fellow                                   Parsippany, NJ 07054-2711
Cisco Systems
jdrosen at cisco.com                              FAX:   (973) 952-5050
http://www.jdrosen.net                         PHONE: (973) 952-5000
http://www.cisco.com

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