I have what is marked Protel 8000 COCOT board. I actually had one working for a while. Dial a number, it would say deposit a dollar, then i could dial. I had no coin relay attached. Then, i attached a coin relay, deposited my dollar, hung up, relay operated. Now, nothing works. Dial a number, i can still hear faint dial tone, i can dial, but after dialing, all i get is a busy signal. So, what happened?