Those settings have nothing at all to do with conference.  Check out energy level settings in conference profile.

On May 11, 2016, at 9:45 AM, Alexander Haugg <Alexander.Haugg@c4b.de> wrote:

Hi,
 
At the moment i can’t disable VAD.
I Try 
<action application="set" data="rtp_disable_vad_in=true" />
<action application="set" data="rtp_disable_vad_out=true" />
Before the conference will entering.
 
I set the vad = none in the sofia profile
 
I set the comfort-noise in the conference config = 0
 
But the VAD in the Conference is working again.
Is there another idea?
 
Thanks a lot