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Originally posted by nevtxjustin:
I'm experiencing the same issue with port/extension 110 having its buttons light up for no reason on the 8-port expansion card on a new DX-120 system. I already unassigned the features and swapped out phones. It might be a coincidence its port 110 as your problem is, but I'm suspecting a dirty phone jack (an upside down mounted wall jack that's been there at least 15 years)... I replaced the wall jack and used the spare pairs...will see what happens for a week.
I haven't had any problems with ext 110 anymore, might have been a bad pair or dirty wall jack after all.

No other problems with six other DX-120 systems using both the 8 port and 16 port cards for ext 110.