In one embodiment of the invention, a real-time firewall processor includes a
controller and a filter. The controller specifies a filtering characteristic based
on a control protocol from a call server serving a firewall between a source and
a destination networks. The filter is coupled to the controller to filter a packet
in a call transmitted from the source network based on the filtering characteristic,
the filter accepting the packet if the packet satisfies the filtering characteristic
and rejecting the packet otherwise.
