Plantronics + Polycom. Now together as Polycom

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

SoundStation IP 6000

Combined download should be used where phones may be running pre-4.0 BootROM. 
Split download file is recommended, but requires that all phones are running BootROM 4.0 or newer.

UC Software 4.0.15 is a maintenance release for OpenSIP. 

Document Name Language
Polycom End User License Agreement