Lync Server 2010 Video Interoperability
The new Lync Video Interoperability Program introduces three new qualification programs-VTC, MCU, and gateway. Each program targets different use cases and addresses key interoperability areas in different ways. After you determine which use cases you would like to implement, refer to the corresponding qualification programs to determine how they implement interoperability with Lync and which ones are right for your organization.
Download it here: http://www.microsoft.com/download/en/details.aspx?id=27254