Are you sure you are being paid a legal rate of pay for being on-call? Hospitals cannot pay their nurses $6.50 an hour to be on-call. If employees actually have to respond to a call within less than an hour they should be paid at least minimum wage for the time spent on-call. The time spent on-call should be treated as hours worked leading to overtime.
I am seeing quite a few healthcare workers in Bakersfield being paid sub-minimum wage to be on-call. Not long ago I settled a class action for some hospice nurses who were paid sub-minimum wage to be on-call.
I can be reached at 1-877-525-0700 if you have questions about whether you should be paid minimum wage or your regular hourly rate to be on-call, and how that effects overtime.