I have 2 empty line slots. The other two have 400D ktu cards that do work. So, I am hoping everyone can give me pointers on how to hook up the phones. I am not using the amphenol connectors- I am hardwiring everything. If it all works, then I will get fancy later. Thanks EV. I figured out the melco wiring, and I am begining to understand how this all works. Believe it or not- Years ago, I actually had this thing working- but I didnt fully understand it, and the features didnt really work and nothing would ring. Thanks a lot to everyone who is helping.