VoIP White Paper
300 Main Street • East Rochester, NY 14445 • Toll Free 1-866-ALLWORX • 585-421-3850 • www.allworx.com
© 2006 InSciTek Microsystems, Inc. All rights reserved. Allworx is a registered trademark of InSciTek Microsystems. All other names may be
trademarks or registered trademarks of their respective owners.
Revised: February 8, 2007
Page 20
12 Remote Office Phones
The Allworx server and Allworx VoIP phones are designed to work together as seamlessly as possible. In
particular, InSciTek has tried to make it as straightforward as possible to install and maintain remote office
phones – nearly as easy as local main office phones. In this section, “remote phone” refers to a standalone
phone that operates in conjunction with an Allworx server located at distant site, without having a local Allworx
server installed. The most typical example would be a phone at an employee’s home working off the main
office’s Allworx.
In most circumstances when using server release of 5.2 or newer a single properly configured 3
rd
party firewall
may reside between the Allworx server and the Internet if the public address assigned by the 3
rd
party device is
properly configured into Allworx. However, in some circumstances, it will be important to have the Allworx
server installed with its WAN port directly connected to a publicly routable IP address on the Internet. The
exact requirement here is a property of the 3
rd
party firewall capabilities and whether or not any used ITSP’s
will support the desired configuration.
The remote phone itself must have Internet access to the Allworx server, but the remote phone is typically
allowed to be installed behind a single NAT/Firewall. This is usually the NAT/Firewall protecting the LAN on
which the remote phone resides.
Configuration of the remote phone is mostly automatic and works similarly to installing phones on the main
LAN of the Allworx server. The remote phone requires two specific settings to be set by the administrator:
Boot Server IP The public IP address of the Allworx server’s WAN port. This IP
address tells the phone where to find the main office server on the
Internet.
Remote Plug-and- Play Key This numeric code number is the authentication key that the phone
uses to authorize itself for the remote Allworx server. If the correct
key is not entered, the Allworx server will not allow the remote
phone to place calls through it. This is a security measure to help
prevent unauthorized users from using services on the Allworx
server. The correct setting is located in the configuration setting on
the Servers->VoIP page of the server’s administration screens. The
value is common to all remote phones associated with a particular
Allworx Server.
Beyond this, generally speaking, the remote phone operates the same as any other phone on the main site’s
LAN. The station can make and receive calls and be configured just like any other station. There are only a few
limitations in capabilities:
• Intercom works fine, but paging functions do not extend beyond the local LAN. Neither zoned nor
overhead pages will typically play out at the remote site.
• If more than one remote phone is behind the same third-party NAT/Firewall, the remote phones may not
be able to call each other successfully without some specific 3
rd
party firewall configuration.
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