If the CO line works properly when disconnected from your system KSU, something in the KSU is keeping that line off-hook. If the trouble isn't caused by a phone that's holding the line, try resetting the KSU by shutting it off and unplugging it from the AC line. Reconnect the power and turn the system back on. This should clear up the problem if it was due to the controller being confused, which can sometimes happen. If the system picks the line again and holds it, check the phones for one with a stuck line select button. Then you'll need to have the KSU serviced if the trouble continues.
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