You connect a Polycom CX300 telephone to your computer that is running a Microsoft Lync 2010 client. In this situation, the voice mail Light Emitting Diode (LED) on the telephone does not turn on when you receive a new voice mail.
This issue occurs because the Lync 2010 client does not send the Human interface device (HID) report to turn on the voice mail LED.
To resolve this issue, install the following cumulative update:
2571543 Description of the cumulative update package for Lync 2010: July 2011
For more information about HID drivers, visit the following Microsoft website: