SYSTEM FOR CONTROLLING ACCESS TO A SERVICE, AND CORRESPONDING METHOD, CONTROL DEVICE, AND COMPUTER PROGRAM

The invention relates to a system for controlling access to a service offered by a communications network. According to the invention, such a service is accessible via a plurality of private access stations to the communications network, such as home gateways (HG1, HG2, HG3), which are into an access network dedicated to the service. A separate location area (LA1, LA2, LA3) is assigned to each of the home gateways (HG1, HG2, HG3). At least one controller (11) associated with the home gateways is adapted to use, in the event of a location updating procedure initiated by a user terminal: means for determining a category to which the user belongs; and means for controlling access by the user terminal to one of the home gateways as a function of the category so determined, these means being adapted, in the event of refusal of access by said user terminal to one of said home gateways (HG1, HG2, HG3), to send said terminal a refusal message including a rejection cause that is a function of the category determined for said user.