Here you are on-call for two weeks straight. First week you are first on-call from midnight Sunday to midnight Sunday then second week you are second on-call. Usually, its Friday and Saturday night when you get called because we don't have an overnight photog those nights. You get called its an automatic 3 hours, even if you only work an hour. Each call out is that way. However, you don't get paid just being on-call. You have to actually be working. Second on-call you only get called out if the first on-call has already been called in and is working.
This is the way it worked at my station. It worked, but it was far to easily abused. With ONE person "required" to be responsible for all call outs, it can get ugly. One person who'd automatically responsible for covering the shift of anyone out on vacation, or sick, on top of their normal shift. All overnight call outs as well.
One weekend I was literally on the clock from 8:00 am Friday to 3:00 am Monday. In that time I covered my normal day shift, someone's Friday night shift, all the Friday/Saturday overnight spot news, another vacation relief shift Saturday and Saturday night, call outs again on Saturday night and vacations relief shifts again on Sunday. I slept a few hours at a time between the overnight call outs on a sofa in the photogs lounge because I was too exhausted to drive home, only to be awakened again within an hour or two. When I protested, all I got was "but YOU'RE on call this weekend!!" I ended up being on the clock for 57 hours straight, 49 of them being overtime. At 3:00 am on Monday morning (5 hours before my normal day shift started) I refused and went home.
Needless to say, the ND was NOT happy on Monday morning when she found out the desk didn't find someone else to help out. Not to mention that I blew a major hole in her OT budget for the entire month in 3 days.
Personally, when you do it this way I believe if you are at beck and call to the desk for this amount of time, you should be compensated to some degree for the "requirement" of giving up ALL of your personal time.