I am curious as to how the states run this. I am fairly sure that in a turn out the bloke sitting in the FCC (the room with the view and I am presuming where the Unicom would be) once having activated the call out then goes and gets into a truck to respond. The lines etc then divert to Adelaide or the NOC or somewhere for relaying. Since the neither of the latter would be particuarly adept at being a unicom for any given airfield, there would need to be another ARFF member assigned to each station.
So I guess my question is, how do the Firies in the states do it? Do they have additional staff to supply the service? Does the service stop when they respond to something?