Article ID: 2815425 - View products that this article applies to.
Consider the following scenario:
This issue occurs because your Lync 2013 client is not recognized as the preferred endpoint.
To resolve this issue, install the following cumulative update:
(http://support.microsoft.com/kb/2812461/ )Description of the Lync 2013 updates: February 2013
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.