Hey
You might know it, or not, but I've been working on a Firefighter mod for the last 2 months. The mod is almost done, although there is no release date at this time.
There are currently, 5 different type of callouts:
Medical run: This callout actually have 4 different "sub" callouts (taking place at different type of places);
M.V.A
Vehicle Fire;
Automatic Fire Alarm;
a super secret callout never made for GTA;
Another super secret callout also never made for GTA.
EDIT: MO