Hi,
In our test enviroment Communicator R2 works on an OCS 2007 pool. However, we looked at the release notes for Communicator R2 and we found this incompatibilty:
Issue: Office Communicator 2007 R2 users who are logged on to an Office Communications Server 2007 computer observe incorrect behavior during incoming calls. For example, clicking "answer call" on the incoming call system alert does not result in an audio conversation, the user gets disabled call control regions, and the call is disconnected after some time.
Resolution: Do not use Office Communicator 2007 R2 with Office Communications Server 2007
Is this referring to a P2P audio (communicator) call or a PBX (telephone) call?