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System Options 357
Installation and Maintenance Guide
• NAT (Network Address Translation) — Business Communications Manager 2.5 supports
both static and dynamic NAT for a number of packet types and protocols. NAT is a network
security feature that translates the IP addresses used within your private network to different IP
addresses known to internet users outside your private network.
• Policy Management — Business Communications Manager 2.5 allows you to implement
classes of service and assign priority levels to different types of traffic using the DiffServ
network architecture. You can configure policies that monitor the characteristics of traffic (for
example, its source, destination, and protocol) and perform a controlling action on the traffic
when certain user-defined characteristics are matched.
• VPN (Virtual Private Networks) — Business Communications Manager 2.5 uses the PPTP
(point to point tunneling protocol) and IPSec (IP security) tunneling protocols to create secure
extranets. These secure extranets provide safe transport of data to and from the Business
Communications Manager using the public data network (PDN).