Hi,
You can disable the prompt "Don't show this again" by clear the Option "Before I join meetings, ask me which audio device I want to use" in Lync Option--Lync Meetings.
Also you can change the way to join Lync meeting in the interface of "Lync Meetings".
Best Regards,
Eason Huang
Hi,
You can set it by using GPO or SCCM.
Here is the registry path for the setting:
Lync 2010: HKCU\Software\Microsoft\Communicator\JoinAudioConferenceFrom
Lync 2013: HKCU\Software\Microsoft\Office\15.0\Lync\JoinAudioConferenceFrom
The default value is "1", which Prompt before joining or changing an audio source
You need to change it to "0".
More details:
http://blogs.technet.com/b/csps/archive/2011/06/15/regoverrideaudiosource.aspx