Access and service e.g. mobile Internet protocol service, registration managing method for e.g. Internet protocol network, involves receiving message granting network access and indicating registration of terminal with service on terminal

The method involves sending a message (31), with data indicating a request to access a telecommunication network (12) and registration with a telecommunication service, from a terminal (30), via another network (43). The access to the network (43) and registration with the service is granted to the terminal, based on an authentication function and data, when the message is received in the network (12). Another message (32) granting access to the network (43) and indicating the registration of the terminal with the service, is received on the terminal from the network (12) via the network (43). Independent claims are also included for the following: (1) a terminal in a telecommunication network comprising a function for authenticating the terminal and offering a telecommunication service (2) a telecommunication gateway adapted to cooperate with a terminal belonging to a telecommunication network comprising a function for authenticating the terminal and offering a telecommunication service (3) a system for managing access to a network and registration of a terminal with the service (4) a computer program destined to be installed in a terminal, comprising instructions to implement a telecommunication network access and telecommunication service registration managing method, during an execution of the program by the processing units of the terminal (5) a computer program destined to be installed in a gateway, comprising instructions to implement the telecommunication network access and telecommunication service registration managing method, during an execution of the program by the processing units of the gateway. Un terminal (30) appartient à un premier réseau de télécommunication (12), qui comprend une fonction d'authentification (33) du terminal et qui offre un service de télécommunication (34). D'une part l'accès au réseau et d'autre part l'enregistrement au service sont gérés en une phase commune pour le terminal (30). Dans cette phase, on émet depuis le terminal à destination du premier réseau, via un second réseau (43) relié au premier réseau, un premier message (31) comprenant des informations indiquant une requête d'accès réseau et une requête d'enregistrement au service. Puis, sur réception du premier message dans le premier réseau, on décide, sur la base de la fonction d'authentification et des informations comprises dans le premier message, d'autoriser le terminal à accéder au second réseau et d'enregistrer le terminal au service. Ensuite, on reçoi