> But still I can see scenarios where the current behaviour can cause problems. 
> Imagine a small dialog timeout combined with SIP Session Timer keep-alive 
> re-INVITEs. The proxy 1 would not expire the dialog, but proxy2 (which did 
> not got the re-INVITE) would expire it. 

I also came across that issue, but the other way round. I started with a short 
session timer, intending to extend it on every re-invite according to the timer 
values in the sip message and reply. This turned out not to work, as the peer 
nodes would not get an update on re-invites and thus fire the timeout and 
expiring the dialog from memory, and also sync state 5 (delete) back to the 
node handling the dialog causing the next in-dialog sip message hitting a 481 
dialog not found.


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