So this evening I actually got around to hooking up some phones! And I've run in to a strange problem. I have four lines appearing at each set, all the same. What I don't have is a steady light to indicate that a line is in use. I have incoming call blinking and on-hold winking, but no steady in use light. This is true for all the sets and all the lines. That leads me to believe that I missed a power connection to the KSU or perhaps a blown fuse, but initial investigation didn't find it. Anyone run in to this before? Thoughts?

Problem solved. I'm not going to say what it was just yet. There seems to be a fine tradition of quiz giving on this board and I wouldn't want to miss out on tradition.