I know some of the older Rockford stuff was using what looked like a phone cord for some of their stuff, but it wasn't the same thing and it cost me $250 to have my processor fixed because I used the wrong cable. The wires looked the same, but phone cables flip the wires inside and they aren't running in exactly the same order on both ends. You can see it if you hold both ends of the phone cable side by side and compare the order the wires are run into the connector. I made a costly mistake, make sure you don't.