Polycom VSX Series manual Configuring the System for Use with a Firewall or NAT

Administrator’s Guide for the VSX Series

3.Select and configure these settings:

Setting	Description
Dynamic	Specifies whether to let the system automatically find the
Bandwidth	optimum line speed for a call.
Maximum	Specifies the maximum transmit line speed between 64Kbps and
Transmit	1920 Kbps.
Bandwidth
Maximum	Specifies the maximum receive line speed between 64Kbps and
Receive	1920 Kbps.
Bandwidth

Configuring the System for Use with a Firewall or NAT

A firewall protects an organization’s IP 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	Description
Fixed Ports	Lets you specify whether to define the TCP and UDP ports.
	• If the firewall is not H.323 compatible, enable this
	setting. 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 setting.

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