Both the VCON and Zydacron systems have been thoroughly tested and are known to work well with the MCU's that we have been using. You are encouraged to investigate both. It does not have very effective echo suppression so you will probably have to use a headset or an echo-canceling speakerphone. VCON software updates are by paid subscription. This is a higher-priced system that VCON, but it has better video, user interface, and control tools, and it has good echo suppression.
Software updates are free.
The camera that comes with either of the above systems is small, and typically sits on top of your monitor. It works best for one-person views, as it has a fixed focal length and is aimed manually. If you wish to involve larger groups or rooms, then a separate more powerful camera is needed. The SONY EVI-D30 is recommended. It has a zoom lens and infrared remote control for aiming and zooming.