The Lync automatically detects the devices attached to your computer. That is what is expected today of any software that provides Audio/Video capabilities. In today blog we are going to look at how Lync or how most of the software application detect the Audio device on you Windows Desktop or Laptop Client. We shall also look at some troubleshooting steps that can be followed when automatic detection fails.
Read more at source: http://blogs.technet.com/b/11/archive/2014/09/23/lync-2013-explained-no-audio-detected.aspx