After a couple weeks break from this, I'm back after our phone guy dropped off a couple of tone intercom units. I have a Melco KC-19 and a Valcom V-119RT. The only connection on them is the long-narrow connector like what the phones use, that sorta looks like a centronics parallel port plug. You guys were talking about the complicated wiring for this, but this box looks like it just plugs in like a phone. What's the deal?

Walter