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:
To resolve this issue, install the following cumulative update:
2670326 Description of the cumulative update for Lync 2010: February 2012
For more information about the client-side logging and diagnostics, visit the following Microsoft website: