I seem to remember running into this problem before but I so seldom see these anymore I can't recall what I did to correct it. Did a search through here and will try plugging an M-7310 in to reconfigure line and icm buttons. The phone rings when called but no buttons light up. Tried reducing and increasing the number of icm channels, tried with and without handsfree etc. Thought I'd see if anyone here remembers the fix off hand.
Phonehed in Dallas
Phonehed in Dallas