VoIP networks depend on a large number of configurable parameters for their successful operation: IP and MAC addresses of end-user terminals, routers, firewalls, and VoIP-specific elements such as call processing components used to place and route calls. Many of these network parameters are established dynamically every time network components are restarted or added to the network. Because a network has so many locations with dynamically configurable parameters, intruders can choose from a wide array of potentially vulnerable points of attack.
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