Plantronics + Polycom. Now together as Polycom

Voice
Business Media Phones (CCX Series)
DECT IP Phones
QSX
Interop Solutions

CX300

The Polycom CX300 IP Phone is designed specifically for use with Microsoft Office Communications Server 2007 R2 version 3.5.6907.37. It must be connected to a properly installed and configured Microsoft Office Communications Server 2007 system. No PC drivers or software are needed.