I agree with Nick. Checking all the oficial TP Server documentation, you won't find anything informing that TP Server supports VAD. So I could say surely it does not support.
Well, for me, TP Server does not support VAD because VAD is not helpfull in video calls. In a video call, the heaviest traffic is the video streaming and not the audio streaming, mainly regarding TP Server that supports multiple screens and brings a imersive telepresence experience. So, if you plan to use VAD with TP Server in order to save bandwidth, it does not make much sense in my opinion, once you will still have video traffic crossing the network, furtheremore, again, TP Server is designed to imersive telepresence mainly.
I know you have audio only participants, but I am just trying to show that TP Server is designed to imersive telepresence experience and not to be a common audio bridges for VoIP calls, that's why I think Cisco has not implemented VAD on TP Server.
In my experience with Cisco Unified Communication, I would say that VAD normally is applicable in small VOIP links, where bandwidth saving can make some difference. But in high definition video calls, I don't think it is helpfull. Furthermore, most users that I have seen do not like VAD.
Can you tell us more about your need? Why do you need to use VAD?
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