> IMO the issues you raise were not considered during 
> the development of session timer, and it doesn't 
> really address them. As a result there are some 
> ambiguities.

Hi Paul,

The comments were raised; however I'm not sure they were considered. :)

http://www1.ietf.org/mail-archive/web/sip/current/msg10194.html


And similar race conditions have been raised concerning things updatable
within a dialog by things like INVITE, UPDATE, SUBSCRIBE, 2xx, and other
requests.

https://lists.cs.columbia.edu/pipermail/sip-implementors/2002-November/0
04089.html


<snip>

> As a result, we can speculate on the best way to handle 
> these things, but it may require a new RFC, or at least 
> a BCP, to have any confidence that these things work.

I agree that a solution or BCP would be beneficial.  However if
possible, I'd prefer a generic solution or BCP instead of an individual
solution for each header and race condition.

The problem exists for almost any header/body updatable within a dialog
by things like INVITE, UPDATE, SUBSCRIBE, NOTIFY, REFER, 2xx, 1xx, and
other requests.

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