Polycom V500 System Administrator's Manual page 29

To set up the V500 system to work with a firewall and NAT:
1. Go to System > Admin Settings > Network > IP > Firewall.
2. Configure these settings:
Setting
Fixed Ports
TCP Ports
UDP Ports
NAT Configuration
NAT Public (WAN)
Address
Description
Lets you specify whether to define the TCP and UDP ports.
If you select Fixed Ports, the V500 system will restrict its
port usage to the range of TCP and UDP ports you specify.
(The system defaults to a range beginning with port 3230 for
both TCP and UDP.) If you do not select Fixed Ports, the
system will dynamically allocate ports on a call-by-call
basis.
• If the firewall is not H.323 compatible, enable this option.
• If the firewall is H.323 compatible or if the system is not
behind a firewall, you may not need to enable this
option.
Lets you specify the range of TCP and UDP ports used by
the system.
Note: The TCP and UDP port ranges you open here must
match those that you opened for your router (including TCP
port 1720, which allows H.323 traffic). Refer to the previous
section, Configuring Router Port Forwarding
for information about opening ports for your router.
Lets you 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.
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 obtain this address by
looking at your router configuration or by asking your
network service provider.
Configuring Network Use
on page 3-7,
3 - 11