a system and method for providing early warning notifications to telephone subscribers having calling number delivery service . the system uses an advanced intelligent network to initiate several calls in rapid succession to all calling number delivery subscribers located within a pre - determined geographic area . a code identifying the disaster warning message is transmitted to the subscribers &# 39 ; calling number delivery systems in place of an actual calling line identification . subscribers having calling name delivery service receive the disaster code and a text message briefly describing the disaster warning .