Article ID: 2673305 - View products that this article applies to.
Consider the following scenario:
This issue occurs because the telephone device driver is handled incorrectly.
To resolve this issue, install the appropriate cumulative update for the telephone that you are using:
For HP 4110 and HP 4120 telephones
2672743For Polycom CX500, Polycom CX600, and Polycom CX3000 telephones
(https://support.microsoft.com/kb/2672743/ )Description of the cumulative update for Lync 2010 Phone Edition for HP 4110 and HP 4120: February 2012
(https://support.microsoft.com/kb/2672349 / )Description of the cumulative update for Lync 2010 Phone Edition for Polycom CX500, Polycom CX600, and Polycom CX3000: February 2012
For Aastra 6721ip and Aastra 6725ip telephones
(https://support.microsoft.com/kb/2672352/ )Description of the cumulative update for Lync 2010 Phone Edition for Aastra 6721ip and Aastra 6725ip: February 2012
The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.
Article ID: 2673305 - Last Review: March 16, 2012 - Revision: 2.0