How do I get the feature key to stop blinking?
These phones work on about 8 NEC phone systems, but most are just newer versions of the same system. So, most likely the callback feature has been activated. Someone internally calls you, you don't answer, they dial # to activate callback. You come back to your phone, see feature key flashing, lift handset, dial #, call goes to whoever set callback, then feature key stops blinking.
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