Phone of the Day: Nortel M5316 Centrex Telephone at Chicago Police Headquarters

I saw this interesting image online attached to an article about the former Chicago Police Superintendent.

The photo shows a M5316 with an M522 key expansion module. The city of Chicago runs Nortel Centrex throughout all of their facilities. It’s good to see the system alive and well here. I believe it’s the safety and security of these phones that keeps them installed. I don’t know what that other phone is off to the right.