Does anyone know how best to configure Endpoint 12.1.2 on Office Communicator Server 2007 R2? I installed it using the default settings and some functions in OCS stopped. When I unistalled Endpoint client everything worked. Not sure what to change on the Endpoint client so it will work with OCS.
What components are you running on the server?
Check this from MS
http://support.microsoft.com/kb/943620
Make sure you only install Antivirus and Antispyware components only,
Firewalls ( NTP ) will cause some issue if rules are not configured properly.
what components you installed?
Have a look at two similar threads:
https://www-secure.symantec.com/connect/forums/sep-chokes-ms-ocs-server-2008
https://www-secure.symantec.com/connect/forums/what-folderfile-exceptions-should-be-made-office-communications-servers