Re: [Simple] MSRP chat: draft-niemi-simple-chat-04.txt

[Paul Kyzivat <pkyzivat at cisco.com>]

This is a great improvement. My remaining comments are primarily about 
nicknames:

- as you already comment, I think nicknames belong as a feature of 
conferences in general, not MSRP mixer sessions. In principle, I think 
the assignment of nicknames should be handled via the conference control 
protocol. (Whose accronym I currently forget.) As a result I am troubled 
by using MSRP as a protocol for doing this. (Should we also extend RTP 
to support assigning of nicknames?) The implications of doing this then 
cascade down to having new SDP to negotiate whether the MSRP peer is 
capable of assigning nicknames.

- (minor editorial issue) I think you intend to permit other mechanisms 
to deal with nickname retention. There is some language to that effect. 
But there is also language that brings this into doubt:

   In other words, a nickname is simply a username that is scoped for a
   particular chat room.  Such nicknames are allocated on a first-come
   first-served policy, meaning they can also be "stolen".  It is out of
   the scope of this specification to define nickname retention schemes,
   or nickaming services as discussed above.

This seems too strong about what a nickname *is*. I think it would be 
good to say that the server *may* issue nicknames scoped this way. But 
the user should be able to suggest any nickname that it believes the 
server may allow it to use, and the server may accept it. This would 
give much more latitude for future work.

- The lifetime of the nickname is said to be the lifetime of the 
session. But it isn't clear if that is the MSRP session or the SIP 
session. (IMO it ought to be the SIP session.) One might retain the sip 
session and change the MSRP session. This really highlights whether the 
nickname is chat specific.

That's all.

	Paul

Miguel Garcia wrote:
> We have just submitted a new version of the MSRP CHAT draft. This has 
> changed substantially from earlier versions, so I wouldn't dare to 
> summarize the changes.
>
> Until the document is published, you can fetch a copy from:
> http://people.nokia.net/~miguel/drafts/draft-niemi-simple-chat-04.txt
> http://people.nokia.net/~miguel/drafts/draft-niemi-simple-chat-04.html
>
> Comments are welcome.
>
> BR,
>
>
>         Miguel

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