Polycom VSX Series Administrator's Manual page 74

Administrator's Guide for the VSX Series
Configuring the System for Use with a Firewall or NAT
3 - 12
A firewall protects an organization's network by controlling data traffic from
outside the network. Unless the firewall is designed to work with H.323 video
conferencing equipment, you must configure the system and the firewall to allow
video conferencing traffic to pass in and out of the network.
Network Address Translation (NAT) network environments use private internal IP
addresses for devices within the network, while using one external IP address to
allow devices on the LAN to communicate with other devices outside the LAN. If
your system is connected to a LAN that uses a NAT, you will need to enter the
NAT Public (WAN) Address so that your system can communicate outside the
LAN.
To set up the system to work with a firewall or NAT:
1. Go to System > Admin Settings > Network > IP > Firewall.
2. Configure these settings:
Setting
Fixed Ports
TCP Ports
UDP Ports
Description
Lets you specify whether to define the TCP and UDP ports.
• If the firewall is not H.323 compatible, enable this option.
The VSX system assigns a range of ports starting with the
TCP and UDP ports you specify. The system defaults to a
range beginning with port 3230 for both TCP and UDP.
Note: You must open the corresponding ports in the
firewall. You must also open the firewall's TCP port 1720 to
allow H.323 traffic.
• If the firewall is H.323 compatible or the system is not behind
a firewall, disable this option.
Lets you specify the beginning value for the range of TCP and
UDP ports used by the system.
Note: You must also open the firewall's TCP port 1720 to allow
H.323 traffic.
www.polycom.com/videodocumentation