Hope this helps :

VAD in FreeSWITCH

VAD can be set in endpoint profiles and can have 4 values:

• in - turn on VAD for incoming media,
• out - turn on VAD for outgoing media,
• both - turn on VAD for both incoming and outgoing media,
• none - VAD is completely turned off.

On Wed, Feb 27, 2019, 6:55 PM Stefano Bertuola <stefano.bertuola@gmail.com> wrote:

About VAD the documentation is not really clear.

I tried to place in dialplan following lines, but I am not really sure if they are correct: 

<action application="set" data="bridge_generate_comfort_noise=true"/>

<action application="set" data="rtp_disable_vad_in=true"/>

<action application="set" data="rtp_disable_vad_out=true"/>

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