Polycom V500 System Administrator's Manual page 25

Because NATs and firewalls provide security for your network, they limit
outside access to your internal network. Some access, however, is necessary
for video communications. To enable your V500 to freely place and receive
calls with the outside world, while still maintaining protection for your
network, you must open ports in the firewall. This process is known as port
forwarding or pinholing.
The following sections describe the steps you need to take to place video calls
through a network router, including:
• Configuring router port forwarding
• Configuring firewall and NAT properties on the V500
Configuring Router Port Forwarding
To make video calls with your V500 system when you have a router, you must
open and assign ports in the firewall. This section describes how to do that
with the most common routers from NetGear®, Linksys®, and D-Link®. Most
other routers require similar procedures.
Before you can change your router configuration, you must know:
• The IP address of your router, which you can find in your router's
documentation. (Note that many routers use the default address
192.168.1.1.)
• Your router's administrator name and password, which you can find in
your router's documentation. (Note that many routers use the default user
name admin and the password blank or password.)
• The IP address that has been assigned to your system if you're using
DHCP, which you can find on the LAN Properties screen. (See
Configuring LAN Properties
With any router brand or model, you must open the ports listed here:
Port Function
1720 H.323 call setup
3230-3235 Signaling and control for audio, call,
video, and data/FECC
3230-3253 Audio and video RTP media streams
1503 T.120 data collaboration
(optional)
Refer to the Actions that Cause the System to Restart
if you want advanced port configuration information.
on page 3-3 for more information.)
TCP or UDP
TCP
TCP
UDP
TCP
section in the
Configuring Network Use
Appendix
3 - 7