CONNECTING A CIRCUIT-SWITCHED WIRELESS ACCESS NETWORK TO AN IP MULTIMEDIA SUBSYSTEM

摘要

. The network device can perform the above- mentioned registration in a delayed manner in connection with phone call setup, if the network device does not know the phone number of the user in question at the time of the location updating. In addition, the network device performs user authentication and creates and maintains an encrypted and secure network connection between the network device and the IP multimedia subsystem by using the data security mechanisms of a real terminal of the IP multimedia subsystem and the authentication and data security parameters of the real terminal received from the IP multimedia subsystem.