Patent ID: 8145211

Claim:
A service continuity system on a mobile telephony network, comprising: at least one nominal location register comprising user data; a backup nominal location register, the backup nominal location register supplementing the nominal location register in the case of failure of the nominal location register, said backup nominal location register being initially empty from user data, the nominal location register and the backup nominal location register being able to process location demands for user mobile terminals, the demands emanating from at least one item of equipment in the network; an information system comprising data on all the users of the network; and a switch arranged to route, when the nominal location register is faulty, the location demands to the backup nominal location register; wherein the backup nominal location register is arranged to send, on reception of a location demand for a mobile terminal and when the backup register does not comprise user data associated with the mobile terminal, a request for user data to the information system, the backup nominal location register being configured to receive the user data associated with the user mobile terminal from the information system and to supplement whichever of the at least one nominal location register is determined to be faulty.