I'm trying to use CUVA 18.104.22.168 with a Logitech QuickCam Pro 4000. I see a solid green line between the 7970 and the Camera Icon. And I can bring up the video check successfully, however when I try to make a video call the video windows never popup. Is this due to not haveing a Cisco VT webcam. Is there some trick to getting this to work?