I have one station (DTH-16D) with the message indicator light blinking green in tandem with the Answer Button light. They're doing two fast blinks, about a second wait, then two fast blinks, repeat etc.

The Message light blinks green, the Answer Button light blinks red, and they blink together, simultaneously.

I have tried everything I can think of, including Feature-99-Feature, and I can't seem to figure out what is happening here.

Also on this station's display, phone numbers are showing up seemingly randomly in the lcd display, though the station isn't ringing. It almost looks like this station is getting caller id signals from incoming calls to our main line (which normally only show up at the operator's station).

Can anyone suss what is going on here?