Method and system for logging a subscriber station onto the packet service-service state control function cscf in a communications system

The aim of the invention is to provide a particularly simple means of authentication and/or authorization of a station (MS) for the connection and/or service state control function (CSCF). To this end, identification information (IMSI) enabling the authentication/authorization of the station (MS) is provided when registration is requested at the remote access server (RAS).