The chicken feet also known as acoustic echo cancellers are equipment that is usually hung from the ceiling. Basically, what this does it’s add both clarity and depth to the resonant frequency response of your audio sub system.
But the most important which you have to understand is the network connection. There are two protocols namely the H.320 and the H.323. If the one you are talking with is using a different one, it will be impossible for you to talk with one another because while the first uses ISDN lines the latter which is much simpler uses IP lines similar to what you use to browse the web.
The good news is that you can still talk to the person on the other end using the older system by using a bridge that is able to handle these mixed protocols.
The advantage of the new system is that you can transmit for multiple uses when the old one can only handle one. The newer version is also cheaper and faster so you get to talk in real time.
How much will you have to spend to get your video conferencing system up and running? Personal users will spend less than $500 while corporations could spend $100,000 or even more. You just have to shop around and see which one is able to fit your needs so you get value for your money.