Processes and identification of an authentication server devices

The invention relates to a method of connecting a terminal of a user in an anchor gateway (PGW) connected to a packet switching network, the method being implemented by an access gateway (AGW) in which is attached the terminal (UE), comprising the following steps: • emission (a102) a user authorization request comprising a user identifier, to a current authentication server (CAAA) , • receiving (a107) of a user authorization answer from the current authentication server (CAAA) comprising a unique identifier to an authentication server (CAAA) having authenticated the user, • emission (a109) a connection request to the anchor gateway (PGW), for connecting the terminal (UE) to the packet switching network, comprising the unique identifier from the authentication server (CAAA) having authenticated the 'user.