I've been playing around with this here and making presence and rls use TCP instead of UDP seems to help with this problem.  Presumably this is because using TCP enforces in-order delivery of messages.

To make presence and rls use TCP I:
It's not a proper fix, but I think it works around the issue.

Regards,

Peter

On Mon, 2011-08-01 at 13:40 +0200, Klaus Darilion wrote: 

Am 01.08.2011 12:28, schrieb Andrew Miller:
> I attempted to insert a dialog entry in the hash table on sending the
> SUBSCRIBE, unfortunately this did not cure the problem
> 
> Has anyone any suggestions for the cleanest and easiest method to ensure
> that the 200 is handled before the NOTIFY?

The cleanest solution would be to establish the dialog when the NOTIFY
is received although the 200 OK is missing.

The NOTIFY can be seen as an implicit 200 OK.

regards
Klaus

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-- 
Peter Dunkley
Technical Director
Crocodile RCS Ltd