This has been in the pipeline for a little while where I work, but so far we have been unsuccessful at making this happen. Although our attempt today was a pretty minimal there seems to be new security restrictions around OCS R2 that may make this a little more difficult than I would like. In particular we are looking to integrate the Tandberg VCS straight to OCS rather than registering Tandberg endpoints to OCS. I will post back when we have made some more progress but all I succeeded in doing today was breaking Exchange UM integration to OCS when messing with OCS settings. Lucky it was only in the lab.
For anyone interested here is the integration documentation.