A utilization review entity shall provide accessibility for covered persons and providers by free telephone at least forty hours per week during normal business hours. Entities located outside of the eastern time zone shall provide covered persons advance written notification of the eastern time zone hours during which those entities are accessible; however, such hours shall be no less than forty hours per week during normal business hours. The entity shall install and maintain an adequate telephone system that accepts and records messages or accepts and provides recorded business hour information for incoming calls outside of normal business hours.