[Sip] Comment on draft-roach-sipcore-rfc3265bis-00

["Elwell, John" <john.elwell at siemens.com>]

Adam,

Thanks for producing this draft, which should set a good example for
revisions of the other SIPCORE RFCs.

I found little to comment on, apart from the following:

In 4.5.1:
"Notifiers MUST implement the GRUU extension defined in
   [I-D.ietf-sip-gruu], and MUST use a GRUU as their local target."

1. Is this just for a SUBSCRIBE-initiated dialog or for any dialog?

2. Should this be package-dependent? For example, there may be some
event packages for which there is no need for subscribing to a resource
on the same device.

3. What if the registrar doesn't support GRUU, and therefore the
notifier is unable to obtain a GRUU?

And by the way, in appendix C I didn't see a mention of changes relating
to the use of GRUU.

John