Mike do yourself a favor and look up VOIP...and then the last word...PROTOCOL..... you can use that protocol anywhere...and Comcast uses it on their own network....NOT on the internet... LOOK I went through a 3 day course in it...trust me I know what I am talking about...and I am getting tired of humoring you here.... There is NO internet involved..... Please move on to something that you have a better handle on.