(iii) join the personnel, facilities, and equipment of the system by a central communications system so that requests for emergency health care services will be
handled by a communications facility which (0 utilizes emergency medical telephonic screening, (II) utilizes or, within such period as the Secretary prescribes will utilize, the universal emergency telephone number 911, and (III) will have direct communication connections and interconnections with the personnel, facilities, and equipment of the system and with other appropriate emergency medical services systems;