Assume that you install a Microsoft Lync 2013 for Android client on a phone, sign in to the client, and then answer an incoming call (either in Lync or in another application). In this situation, you notice that the speaker mode is activated.
To resolve this issue, install the following cumulative update:
2926050 Description of the cumulative update package for Lync 2013 for Android: February 2014
Article ID: 2926054 - Last Review: 11 Feb 2014 - Revision: 1