Polycom manual Configure the V500 system for specific products as follows, Auto

Administrator’s Guide for the V500 System

Setting	Description
NAT Configuration	Lets you specify whether the system should determine the
	NAT Public WAN Address automatically.
	• If the system is behind a NAT that allows HTTP traffic, select
	Auto.
	• If the system is behind a NAT that does not allow HTTP
	traffic, select Manual.
	• If the system is not behind a NAT or is connected to the IP
	network through a Virtual Private Network (VPN), 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)	Displays the address that callers from outside the LAN use to
Address	call your system. If you chose to configure the NAT manually,
	enter the NAT Public Address here.
NAT is H.323	Specifies that the system is behind a NAT that allows HTTP
Compatible	traffic.
Address Displayed in	Lets you choose whether to display this system’s public or
Global Directory	private address in the Global Directory.

Configure the V500 system for specific products as follows:

If you use this type of
NAT or firewall:	Configure your V500 system this way:
	Use Fixed Ports	System is	NAT is H.323
		Behind a NAT	Compatible
Cisco® PIX®	Yes	Yes	No
NOTE: Do not select the
Fix Up H.323 feature.
Cisco® Router NAT	No	No	No
Linksys®	Yes	Setting is ignored	No
Netgear®	No	No	Yes
SMC® Barricade™	Yes	Yes	No

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.

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