The only reason I put that is because my moms work has these panels:
I have no idea what the one on the left does, but the one on the right is an Edwards 6500:
With either 6", 10" or 4" adaptabels.
I think it could be a voice communication panel. I remember my mom telling me that when the alarm goes off for fire drills, Her boss comes on the intercom, telling them where the fire is, for pratice.