I recently installed a 4450 DSS on a 4424D+ phone. I connected the phone to port 17 on an 024 TDL card (to make it an operator) gave it extension# 101 and added it to the DLC operator position list (Merlin Magix is in hybrid/PBX mode.) This system already had a 4424LD+ console on port 1 at extension 100 with a 4450 DSS. The buttons lined up properly on all 3 pages but the line appearances don't light up when the extensions are busy on the new 4450. I can transfer, intercom, etc. with the DSS but no lights. What did I miss?