Try Googling tiba air traffic and quite a lot comes up. TIBA actually stands for Traffic Information Broadcast by Aircraft (not Area) and is a procedure sanctioned by ICAO only as a temporary measure, where there is a disruption of normal ATC services, or outside controlled airspace. Over much of Africa, however, it has been in use for years obviously because the money just isn't there for an adequate ATC service. Yes, it's an accepted practice but hardly in a developed country like Oz or do your bosses have corks hanging round their hats?
