Look for the USB Cable at the Lectern Table which supplies Audio only for your Zoom/Ms Team Hybrid Sessions. 
Plug USB Cable into your Laptop:
Select Microphone - USB Audio
Select Speaker - Crestron (Remember to plug in the HDMI Cable)

If there is No Camera installed in the Seminar Room. You may connect your own Portable Camera. 
Select Camera - USB Camera (Your own device)