"on call" employees and determining hours of service

[Guest MikeD]

How do you all determine hours of service for employees that are on-call. My specific fact pattern is this: Employer hires nurses to answer questions via telephone. These nurses are on-call for certain nights or weekends. If they never field a call, but are on-call, should they get credit for any hours of service? What about if they field multiple questions?

Thanks.

[WDIK]

Are they paid for being on call, or are they only paid if they answer questions?

[Guest jrzgrl]

We go by payroll records; however many hours they get paid for is how many hours for which they get credited.