Appendix B: Network IP Topology
Public (Untrusted) Networks
Inter-Tel
®
5000 Installation Manual – Issue 2.4, May 2008 Page B-11
For the Inter-Tel CS-5200/5400/5600 system and other IP devices to function properly in the
DMZ,
the DMZ must be a non-NAT network. That is, the devices in the DMZ use public IP
addresses. The firewall can still provide some protection from the public Internet, but it does not
translate the IP addresses or port numbers. An example is shown in the following illustration.
Internet
LAN
Remote or home
office Firewall/NAT
LAN
Non-NAT DMZ
Inter-Tel 5x00
Public IP Address(es)
DB Programming,
OAI Apps,
Diagnostics Monitor,
System Monitor
Router/Firewall/NAT
Public
Interface
Private NAT
Interface
Non-NAT DMZ
Interface
UC/SIP Server
Enterprise
Conferencing
IP Endpoint
IP Endpoint
IP Endpoint
IP Endpoint
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