The idea is to let employers speak to their staff
Back in the '90s I was building research ships. A standard fitment there was 'talkback' - a Public Address system covering all the working spaces, with microphones all over the place. Anyone could report a buoy launched, or warn of winch failure, and everyone would know.
Then the project got taken over by an Ex-RN commander. The ships he built had microphones only on the Bridge. When challenged about the impracticallity of it, he replied "People on the back deck have to do what they are told. They have nothing worthwhile to say about it".