Vodavi Starplus STS - NO DIAL TONE, SCREEN BLANK!?

I have 5 Vodavi Starplus STS phones I got at auction and I can't seem to figure out how to test them out. I have plugged all 5 into a working phone line and the red lights come on and the LCD screen stays blank. No dial tone, I tried pressing all the buttons. Am I missing something stupid?
Update: I do not have the KSU, just the phones. Is there no way to verify they work without the KSU? I'd like to put them on Ebay and be able to verify that they work.
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