Maybe this is irrelevant, but I'd like to add another scenario (not sure if you have contemplated this one @henningw): replicating dialogs exclusively via DMQ (with no database at all).

• Proxy1 creates a dialog (let's call it dialogA) and replicates it via DMQ to Proxy2.
• Proxy1 is restarted/crashes/something.
• Proxy1 comes back up before dialogA has expired.
• Proxy1 receives all dialogs from Proxy2 via DMQ (including dialogA).

What would happen when expiration for the dialogA is due?

1- Would Proxy1 send the BYE and then "tell" via DMQ to Proxy2 to remove it from its memory?
2- What if Proxy1 never came back up in time, would Proxy2 know that it should take care of sending out a BYE for that expired dialog?
3- Would both Proxy1 and Proxy2 send a BYE and then tell the other proxy via DMQ to remove it? (this would be a race-condition I believe, and one would end up logging a non-existent dialog on syslog?)

I know the subject of this issue clearly talks about scenarios with a database, so if you believe this database-less scenario shouldn't be discussed here let me know and I can create a new issue.

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