I am not sure how to say about reporting to cable supervisor. Why? They have no idea what Videophone is! This is not common for them, that is why they are undereducated. I do not believe this is isolated case. More and more which I heard from cable and DSL employees is making up lies because they have no idea how to solve the problem, and accusing VP as problem causing.
My thinking was file complaint to FCC, and I think this is best route to start with. Why FCC? Simply put, this is about equilvent of telephone communication among Deaf and hearing people. Putting barrier against Deaf is not acceptable practice and this has to be stopped somehow.
What you mean by Internal Ethernet? This is just a type of cable which you normally see as thick blue cord, and they do come in variety of colors.
Lightning might cause some damage to electronic devices.
What is the rest of the sentence, this sentence is like connecting the dots But connecting the Ethernet cable, starting Modem to "WAN" port in back of the router, and you can use any port from 1 to 4 connecting to PC, then another cable to any port 1 to 4 conneting to VP. That is the basic cable set up.