Network Address Translation; Before You Start Configuring Nat; Setting Up Nat - Polycom ViewStation FX User Manual

Network Address Translation

Before you Start Configuring NAT

Setting up NAT

© Polycom, Inc.
Network Address Translation (NAT) lets home office or small
network environments use internal IP addresses for the devices
within the network, while using one external IP address to
communicate with the outside world (Wide Area Network). However,
many Small Office Home Office (SOHO) routers provide NAT
services, but are not full H.323 compliant.
This feature allows you to receive and place calls when operating
the ViewStation FX or VS4000 behind a router which uses NAT but
is not fully H.323 compliant. Although it is best to use full H.323
compliant routers, the ViewStation FX and VS4000 provide this
functionality to assist home office and small network users whose
routers support NAT, but are not fully H.323 compliant.
Note This solution is provided to let the user make calls outside
the internal network. At this time, it is not possible to make
video conferences calls within the internal network when
using this solution. To make video conferencing calls within
the network when using this solution, simply de-select the
System is behind a NAT option and make the call.
Re-select the System is behind a NAT option to re-activate
this feature and make external calls.
1. Determine your NAT's external (WAN) IP address. This is the
address assigned to your NAT's external interface (connected to
the Internet).
2. Determine the IP address of your ViewStation FX or VS4000.
This can be found in the System Information screen.
1. Go to Quality of Service and Firewalls screen (System
Info>Admin Setup>LAN/H.323>H.323>QOS).
2. Select Use Fixed Ports.
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ViewStation FX/VS 4000 User's Guide