I’m not sure how it’s going to be integrated into the current system, or what other components could be on their way. But it might be a sign that the old signals are staying when the building gets renovated.
i’ve dealt with alertus before. it interfaces into fire alarm panels to activate their audibles or pass a voice signal through them if they’re voice systems. can also interface with paging systems instead if your building has a paging system.
We sell a similar product at work called Vigilance which does this but also integrates with security systems and pretty much any system you want as well. Vigilance is a rather new player to the mass notification system market and it’s a great product. Decent priced too.