A strange one...
Lync 2013 Edge, Lync 2013 FE, OCS 2007 R2 FE, all federated split domain to Lync Online
Lync Online clients can see presence of Lync 2013 FE Pool users with no issue. But if a user is hosted in OCS 2007 R2 FE, Lync Online users can only see the presence of OCS users for around 3 minutes and 30 seconds. The presence then changes to presence unknown. Restarting the client then seems to reset it again for another 3:30 - 4 mins.
Lync 2013 FE users can see presence of both Lync Online and OCS users perfectly. OCS users can see both Lync Online and 2013 FE users perfectly.
So we have narrowed the issue down to something to do with communications between the OCS FE and the 2013 Edge? All ports as required are open and we can't see anything FW wise that is dropping or killing packets. We have tested with multiple Lync Online clients, win and mac same issue.
Has anyone seen anything as strange as this?