| 摘要 |
A monitoring network is able to provide surveillance of IP phone calls, which span plural backbone networks, which may embody different transmission techniques. An agent connected through a monitor center to one backbone network enters a request for surveillance (i.e. wiretapping) of a particular network connected to another backbone network. A WatchDog program is associated with each backbone network. These WatchDogs all communicate with other watchdogs associated with other backbone networks. All these watchdogs interact with one another to set up the surveillance connections. The watchdog of the requester's backbone network receives the surveillance request and flows/transmits the request to a watchdog function of the terminating backbone network of the specific caller to be monitored establishing a point-to-point connection, through as many backbone networks as needed. The terminating WatchDog of the termination backbone network flows/transmits the request to a destination WatchDog associated with an IP address mapping checkpoint of the target telephone number to be surveillanced. The destination watchdog communicates with the requesting WatchDog using predefined protocols spanning the intervening backbone networks. The destination WatchDog replicates the packets of the target telephone and transmits them to the originating monitor center.
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