| 摘要 |
A monitoring system is arranged to enable monitoring of traffic in a communications system, the traffic originating from a plurality of devices roaming in a plurality of wireless local area networks. The system receives signalling traffic from a plurality of secure tunnels, each tunnel associated with a wireless network access point, duplicates one or more characteristics of the received signalling traffic to form a pair of duplicated versions of said received traffic, and forwards a duplicated version to a monitoring means. The monitoring means processes the received signalling traffic to determine from one or more characteristics of the received signalling traffic information enabling the identification of the device and the location of the wireless network access point. The signalling traffic is generated by a roaming device which has associated with one or more of said wireless local area networks. The monitored signalling traffic includes traffic generated before the device or its user has been authenticated and may include traffic generated during the assignment of an IP address. The device does not have to generate a request to use of the roaming service to trigger the monitoring of its signalling traffic. |
