Simplified method for ims registration in the event of...

H - Electricity – 04 – L

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H04L 29/06 (2006.01)

Patent

CA 2649229

Simplification of IMS registration in the event of emergency calls is made possible by apparatuses and a method for setting up an emergency-call connection from a terminal (Figure 1: ~terminal~) to an IMS via a network (Figure 1: ~S-CSCF~, ~P-CSCF~, ~GGSN~, ~SGSN~, ~Radio Access Network~...) visited by the terminal, where, if the terminal is already registered in the IMS, setup of an emergency-call connection dispenses with IMS registration of the terminal in the IMS for this emergency-call connection if a comparison between a network identification (~network identifier~, Figure 1: ~MCC1~/~MNC1~) for the visited network, of which the terminal was notified when it registered in the visited network, and a network identification for the terminal's home network reveals a match between these network identifications.

La présente invention concerne des dispositifs et un procédé qui permettent une simplification de l'inscription IMS en cas d'appel d'urgence pour l'établissement d'une liaison d'appel d'urgence par un terminal (Fig. 1 : ~Terminal~) par un réseau visité par le terminal (Fig. 1 : ~S-CSCF~, ~P-CSCF~, ~GGSN~, ~SGSN~, ~Réseau radio~...) avec un IMS (sous-système multimédia IP), au cas où le terminal est déjà inscrit dans l'IMS, lors de l'établissement d'une liaison d'urgence, une inscription IMS du terminal dans l'IMS n'étant pas nécessaire si une comparaison entre une identification de réseau communiquée au terminal lors de l'identification dans le réseau visité (~identifiant réseau~, Fig. 1 : ~MCC1/MNC1~) du réseau visité avec une identification réseau local du terminal donne une concordance de ces identifications réseau.

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