Abstract: The invention relates to a system for activating a television over IP (IPTV) service in an IMS architecture network (2) from a terminal (10) of a user subscribing to a television channel provided by said service. According to the invention, the system includes, in the IMS architecture network (2), an IPTV server (23) containing subscription information associating the user with the channel and information about the reception capacity required for the channel, and the terminal (10) includes means for sending the server (23) a message requesting activation of the television service and containing reception capacity information provided by the terminal (10).

Abstract: A method of translating messages conforming to a first authentication protocol into messages conforming to a second authentication protocol during an authentication phase in which a peer, having an identity and seeking to access a resource of a network, is connected to an authenticator, said authenticator authorizing access to the network as a function of verification of the identity and rights of the peer effected by an authentication server as a function of authentication data received in messages conforming to the second authentication protocol.