I would always ask which team coaches are closer to CO so we would know how to relay messages through.
Need to add this to my pre-game with the R.
The confusion for me comes when the pressbox is on the visitors side of the field. Wouldn't that be the home side, since the pressbox always faces the visiting side? Been to two stadiums this season where this was the case.
The B should pick this up very quickly, and interrupt the game as needed to address the problem. If he doesn't, there are a lot of other eyes out there that will bring it to the crew's attention, pretty dang fast. You shouldn't have to worry about initiating anything.
I did notice that during my game a week ago. The crew got the situation handled and the R relayed to the home team coaches in the pressbox to ask for the PC to be turned off.