http://blogs.technet.com/tliles/archive/2007/11/29/polycom-cx-family.aspxThis line of devices has been designed to work with Office Communication Server 2007.  I am currently using a model similar to the CX200 .    At first look you notice that it lacks a numeric pad, this is because you do your dialing throughen-USCommunityServer 2.1 SP1 (Build: 61025.2)