There shall be at least one operable telephone in the center that is freely and readily available to all center staff during the approved hours of operation. In a center with more than two rooms approved for child care, a staff member supervising a group of children in one room shall be able to communicate a request for assistance to a staff member in another room while maintaining continuous supervision of the group. In each room where care is provided to infants or toddlers, there shall be an operable telephone. The operator shall provide additional telephones or extensions in the center as may be required to: Summon emergency fire and rescue services promptly; and Transmit and receive other emergency communications.