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I'm 99% sure that that was a customer. It's not that hard to figure out the paging system for the phones. All the new phones they're installing now have the word "page" right by the button that you use to page with. The only way that it would be an employee is if someone just got terminated and that was his last hurrah on the way out the door. I've heard random customers get on the paging system every now and then. Mostly because they got tired of waiting for help and took action into their own hands.
They'll probably change them in about a week, requiring some security code before you make a page. And then someone will sue because of someone's stupidity.