Administrator’s Guide for the V500System
3 - 12 www.polycom.com/videodocumentation
Calling Through a Router, Using a DMZ
A Demilitarized Zone (DMZ) is a way to configure a network so that the device
that is in the DMZ (such as the V500) is served by the router, but is outside the
firewall. Depending on your router, configuring the V500system to be in the DMZ
may affect its ability to communicate locally with other devices on the internal
LAN.
With a DMZ, no unauthorized external connections are allowed with the devices
inside the firewall, but the V500 is allowed free access to the Internet. Therefore,
this configuration leaves the V500 without protection from external sources.
Systems deployed outside a firewall are potentially vulnerable to unauthorized access. Visit
the Polycom Security Center at www.polycom.com for timely security information. You can
also register to receive periodic email updates and advisories.
NAT Configuration Specify whether the system should attempt to determine the
NAT Public WAN Address automatically.
•If the system is behind a NAT that allows HTTP traffic, select
Auto. The system will attempt to automatically discover the
NAT Public WAN Address.
•If the system is behind a NAT that does not allow HTTP
traffic or if Auto fails to discover the NAT Public WAN
address, select Manual.
•If the system is not behind a NAT, select Off.
•If the system is behind a firewalled NAT router that is
UPnP™ (Universal Plug and Play) certified, select UPnP.
Many routers used in homes and small businesses support
UPnP NAT traversal. If this is your situation, try selecting
UPnP first. If this selection does not work for your router,
select Auto or Manual.
NAT Public (WAN)
Address Displays the address that callers from outside the LAN use to
call your system.
If you chose to configure the NAT manually, enter the NAT
Public WAN Address here. You can obtai n thi s address by
looking at your router configuration or by asking your network
service provider.
NAT is H.323
Compatible Specify whether the system is behind a NAT that is capable of
translating H.323 traffic.
Address Displayed in
Global Directory Specify whether to display this system’s public or private
address in the Global Directory.
Setting Description