There is no compensation for being "on call," even if it imposes some limits on your life (e.g. that you can't drink, or have to stay someplace you can be reached by phone): even though there are some restrictions from the nature of your job, when you are not working, you can still watch TV, socialize, shop, do errands or chores, work out/execise, etc.--i.e. you have more than sufficient control over your own time that this would not be considered paid work time.However you do need to be paid for *all* time taking calls, dispatching or scheduling drivers or work crews, coordinating with or giving status updates to managers, etc. They can't just arbritrarily say it is 2 hours of work, if in fact it is more: whatever is the actual amount of time you work from home (or otherwise offsite), you must be paid for it.