System information

System Administration Guide

300 Main Street • East Rochester, NY 14445 • Toll Free 1-866-ALLWORX • 585-421-3850 • www.allworx.com

Revised: March 28, 2007

Page 59

14 Remote IP Phone

A remote IP phone is one where the phone’s Local Area Network (LAN) is not the same as the Allworx

server’s LAN. An example of this scenario is where the Allworx

server is set up at the company’s main office,

but an employee wants to be able to have an office phone at home so that calls to/from that phone work just

as though the employee was at the company’s main office.

14.1 General Network Configuration Requirements

In support of remote IP phone usage, several remote phone and Allworx

server network configurations are

possible:

1. The Allworx

server can be directly connected to the Internet via its WAN port. However, the WAN

cannot be in Use PPPoE mode.

2. The Allworx

server can be behind a single 3

party NAT firewall. This requires a specific server and

firewall configuration that is described below.

3. The remote phone can be directly connected to the Internet.

4. The remote phone can be behind a single 3

party NAT firewall.

Note: Allworx

cannot guarantee proper operation of 3

party networking products. However, Allworx

expects this to work with typical firewalls and tests against several brands. Some NAT/Firewall

configuration may be required.

14.2 Allworx

Server Behind 3

Party NAT Firewall

To support remote IP phones and SIP Proxy usage when the Allworx

server itself is behind a single 3

party

NAT firewall, the server’s Network Mode must be in LAN Host Mode. This can be set on the Network /

Configuration / Modify page.

When set to LAN Host Mode, the page contains a Public IP Address section as shown below: