Artdio IPE 1000 User Manual download pdf (Page 16)

3.3 Working Under a NAT Networking Environment

IP addresses are limited; because of this, not all devices on the Internet can have their own public IP

address. An application is available that allows users to use a private IP address by utilizing a NAT (Network

Address Translation) server. When the packets are sent out from the local area network, the IP header will

be replaced with a public IP address. This is very useful in conserving IP address usage on the Internet.

Most VoIP devices cannot support NAT , since NAT servers only replace the IP headers. However, VoIP

packets have IP information in the data area of every voice packet. So while the voice packet has been

replaced with a real IP header, the data inside is still using a private IP address.

The PBX Gateway is able to use private IP addresses by applying NAT. Most of time, you will not need to

change any configuration settings on the NAT server or even on the PBX Gateway itself. The one essential

condition is that the master device of the group should use a public IP address.

Since there are currently so many NAT servers on the market , there is no set standard in addressing how

to develop NAT servers or how to test the interoperability of NAT servers with other applications. Therefore,

depending on your NAT server, you may have to adjust some of the configurations to specify the

In-bound/Out-bound rules in order to give your NAT server the ability to work with various special

applications.

Fig 8 Supports VoIP under a NAT environment

 Guaranteed only for tested NAT servers or software

 Some of the NAT configuration settings need to specify the In-bound/Out-bound rules, however

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Artdio IPE 1000 User Manual Page 16