The Mobile Station Integrated Services Digital Network (MSISDN) authentication module enables authentication using a mobile subscriber ISDN associated with a device such as a cellular telephone. It is a non-interactive module. The module retrieves the subscriber ISDN and compares it against the data store to find a user that matches the number. If found, the user is validated. For information on the MSISDN authentication module attributes, see MSISDN in Sun OpenSSO Enterprise 8.0 Administration Reference.