An emergency back-up system for enhancing reliability of rescue

H - Electricity – 04 – Q

Patent

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Details

H04Q 3/00 (2006.01) H04M 3/42 (2006.01) H04M 11/04 (2006.01) H04Q 7/38 (2006.01)

Patent

CA 2241921

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

Système permettant d'améliorer la fiabilité de services de secours au moyen d'un système de sécurité pour numéro d'urgence 911 dans lequel on détecte la fin d'un appel d'urgence, après quoi on compose le numéro de téléphone d'un centre d'acheminement prédéterminé (30) qui effectue un appel en retour vers le point d'accès à un service public (PSAP) (28) le plus proche afin de déterminer si les secours sont en route. Dans un mode de réalisation destiné aux téléphones cellulaires, on détecte la fin de l'appel d'urgence en détectant l'indicateur d'appel en cours (20) disponible sur le bus du téléphone. Dans un autre mode de réalisation, le téléphone (10) d'où est parti l'appel transmet son propre numéro au personnel du centre d'acheminement (30) pour leur permettre de rappeler ce numéro afin de déterminer la nature du problème et de s'assurer que les secours envoyés sont arrivés.

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