How should employees be required to notify any unexpected absences?

The rules for notifying absences should specify a named person (normally the line manager) whom the employee must personally contact in the event of unexpected absence. They should require the employee to provide a reason for the absence and the length of time that he or she expects to be absent. If the line manager cannot be contacted at the time the employee phones in, the manager should telephone the employee at home later the same day to obtain the necessary information.