Patent ID: 8204001

Claim:
A method for preventing overload in telecommunications networks with Internet Protocol (IP) Multimedia Subsystem (IMS) by always-on for a call generated by a user, an IMS terminal of said user being formed by a Universal Mobile Telecommunications System (UMTS) terminal and an IMS client; in which process said user makes a Packet Data Protocol (PDP) Context request and a Gateway General Packet Radio Service (GPRS) Support Node (GGSN) of said network provides said user with a free IP address and the PDP Context becomes active; and wherein an Serving Call Session Control Function (S-CSCF) of the IMS network creates a record in which an association between said IP address and a characteristic identity of the IMS network is included; characterized in that the process comprises the steps of: when the GGSN is going to deactivate said PDP Context for having been inactive for a predetermined time, an indication of such deactivation is sent to the IMS client which maintains said characteristic IMS identity-IP address association and marks it as fictitious; and, when said user generates a new call, the IMS client informs the UMTS terminal about the characteristic IMS identity-IP address association marked as fictitious, and the UMTS terminal sends a PDP Context request message, in which message the IP address of said IMS association is included in a determined field.