Abstract: In order to control the authorisation of a user during an attempt to access an IP transport network (5) by means of an access network (1, 2), a user terminal (11, 12, 13) emits an access request to an access supplier (6, 7, 8), containing data for authenticating the user to the access supplier, and said request is then transmitted to an access server (9) of the access network (1, 2) in view of being addressed to a remote authentication server (15) of the access supplier. On reception of the access request, the access server (9) emits a RADIUS request to a proxy server (10) of the access network (1, 2) which determines whether the user must be locally authenticated, and if this is the case, the proxy server transmits, to the access server (9), a request for authentication data to be addressed to the terminal of the user, and carries out a local procedure to authenticate the user, on the basis of the authentication data supplied by the user.

Abstract: The method consists in: a user terminal issuing an access request to an access or IP service provider, the request containing user identification and authentication data with the provider and with an access and IP transport network operator, the access request being transmitted via the access network to an authentication server of the access or IP service provider; previously transmitting the access request to an authentication server of the network operator; the authentication server performing a procedure to authenticate the user on the basis of user identification data with the provider; and transmitting a response message to the user terminal, which response message contains the results of the user authentication by the authentication servers.

Abstract: In order to control the authorisation of a user during an attempt to access an IP transport network (5) by means of an access network (1, 2), a user terminal (11, 12, 13) emits an access request to an access supplier (6, 7, 8), containing data for authenticating the user to the access supplier, and said request is then transmitted to an access server (9) of the access network (1, 2) in view of being addressed to a remote authentication server (15) of the access supplier. On reception of the access request, the access server (9) emits a RADIUS request to a proxy server (10) of the access network (1, 2) which determines whether the user must be locally authenticated, and if this is the case, the proxy server transmits, to the access server (9), a request for authentication data to be addressed to the terminal of the user, and carries out a local procedure to authenticate the user, on the basis of the authentication data supplied by the user.

Abstract: The method consists in: a user terminal issuing an access request to an access or IP service provider, the request containing user identification and authentication data with the provider and with an access and IP transport network operator, the access request being transmitted via the access network to an authentication server of the access or IP service provider; previously transmitting the access request to an authentication server of the network operator; the authentication server performing a procedure to authenticate the user on the basis of user identification data with the operator; the authentication server performing a procedure to authenticate the user on the basis of the user identification data with the provider; and transmitting a response message to the user terminal, which response message contains the results of the user authentication by the authentication servers.