Re: [Simple] Comments on draft-ietf-simple-message-sessions-07

[Paul Kyzivat <pkyzivat at cisco.com>]

A few more comments, starting with the examples:

11.1 - the numbering of the messages doesn't agree with what is in the 
diagram. Also, message 5 is missing a blank line between Content-Type 
and the body.

11.3 - I find the sysadmin example highly unlikely. Why would MSRP 
(rather than page mode MESSAGE) be used for this? A session would first 
have to be established. This would only make sense if there was already 
a session established, or there was expectation that many such messages 
will be sent using the same session.

11.4 - I presume the last message in this example was intended to be 
REPORT, not SEND.

11.5 - Nice example! s/MSPR/MSRP/
Toward the end, when the MSRP session is set up to the nurse, I believe 
"art thou hither" would be sent, just as it was to the other attempts.

12. Extensibility

I believe the decision was that we didn't need version numbers because 
sessions are established using another protocol (e.g. SIP) which can 
handle version negotiation. But we don't have any provision for versions 
there either. The only options I can see that are open for revisions are:

- use a different scheme name (not msrp) in the urls. (ugh)
- invent a new a-line to carry versioning information that can be
  negotiated.

Another possibility, if we plan now, is to put a little more 
extensibility into the msrp url, such as:

      MSRP_urls = msrp-scheme "://" server ["/"
        resource] ";" transport *( ";" msrp-option )
      server = [userinfo "@"] hostport
      msrp-scheme = "msrp" / "msrps"
      resource = 1*unreserved
      transport = "tcp" / token
      msrp-option = gen-param

This would of course require a change to the comparison rules for urls, 
and could make comparison somewhat more complex.

I think we just have a clear idea of a workable strategy for moving to a 
revised protocol.

	That's it,
	Paul



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