We have started deploying the Cisco Video Advantage Camera?s and have run into very few problems or issues. While testing yesterday I tried to set up a 3-way conference call with 2 other individuals that had cameras as well. The first caller and I had voice and video, I hit the conference key, called the 2nd party and he and I had voice and video as well. As soon as I joined all 3 of us together, the audio conferences but the video does not. What am I missing????