Unpaid "On Call" or "Stand By" time

[Dragoon777]

The following occurs in California:
Situation: Employer(U.S. Government Contractor) requires of an hourly, non-exempt employee the following:

• Reside and remain when off duty, within a one hour commute to work location.

• Carry and monitor company provided pager and mobile phone, subject to recall to work at all times 24 hours, daily. 7 days a week. Weekends and holidays included.

• No compensation is paid for "On Call" time, (while U.S. Government Employee peers receive differential pay for "On Call" time).

Question: Should the employee be paid for their "On Call" time?
Thanks in advance.