A user's status when a telephone connection has been established and the user has entered a correct user name and password. If the user has callback permission and has requested callback, the connection is followed by the calling-back phase. If the calling-back phase is followed by a waiting-for-call phase, then the server was unable to reach the user at the specified number. The user may have supplied an inaccurate callback number (in the case of set-by-caller callback), or an unauthorized attempt to access the network may be under way (in the case of preset-to callback).