AN EMERGENCY BACK-UP SYSTEM FOR ENHANCING RELIABILITY OF RESCUE

摘要

A system is provided for enhancing the reliability of rescue services byproviding a 911 back-up system in which the termination of an emergency callis sensed followed by dialing the telephone number of a predetermined dispatchoffice (30), with the dispatch office (30) providing a call back to thenearest PSAP (28) to ascertain whether or not rescue is on the way. In oneembodiment for cellular phone applications, termination of the emergency callis sensed by detecting the call-in-progress flag (20) available on the phone'sbus. In another embodiment, the originating phone (10) transmits the telephonenumber of the originating phone to permit personnel at the dispatch office(30) to call the originating phone back to ascertain the nature of the problemand if dispatched help has arrived.