You receive a System.UnauthorizedAccessException exception when you disconnect a call in a Lync 2010 SDK-based application

Symptoms

Consider the following scenario:

• You set a telephone that is running Microsoft Lync 2010 Phone Edition as your default audio device in Lync 2010.

• You run an application that is based on Lync 2010 SDK to make an audio call.

• You disconnect the call when the telephone is ringing.

In this scenario, you receive a System.UnauthorizedAccessException exception on the Microsoft.Office.Uc.ModalityClass.Disconnect call. Additionally, the following error message is logged in the Lync 2010 ETL log:

Resolution

To resolve this issue, install the following cumulative update:

2670326 Description of the cumulative update for Lync 2010: February 2012

More Information

For more information about the client-side logging and diagnostics, visit the following Microsoft website:

General information about the client-side logging and diagnostics