User`s guide
System Administrator’s Guide – Release 7.2.3.x
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trademarks of their respective owners.
Revised: September 1, 2010
Page 83
14 Remote Allworx Phones and Port Expanders
A remote device is one where the phone or port expander is on a different Local Area Network (LAN) than the
Allworx server. An example of this is where the Allworx
server is set up at the company’s main office but an
employee has an office phone at home. The system can be configured so that calls to and from that phone
work just as though the employee was at the company’s main office. Similarly, analog phones and CO lines
on a remote port expander can be configured so that they are seamlessly integrated into the server’s network
and dial plan.
Caution: Correct routing of 911 emergency calls for remote Allworx phones and analog handsets attached
to remote Allworx Port Expanders cannot be guaranteed. Do not configure remote handsets if
they may be used for placing 911 calls.
Caution: If the network connection between the Port Expander and the Allworx server is interrupted,
regular use of the Port Expander’s FXO and FXS ports will not be possible. The only option for
placing calls through a Port Expander that does not have a functional network connection to its
Allworx server is to plug an analog phone into the Power Fail port. Calls placed using this phone
will be routed to the CO line connected to FXO port 1. No other ports will be functional.
14.1 General Network Configuration Requirements
Several different network configurations can be used:
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
rd
-party NAT firewall. This requires a specific server and
firewall configuration that is described below.
3. The remote phone or port expander can be directly connected to the Internet.
4. The remote phone or port expander can be behind a single 3
rd
-party NAT firewall.
Note: Allworx
cannot guarantee proper operation of 3
rd
-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 a 3
rd
-Party NAT Firewall
To support remote devices and SIP Proxy usage when the Allworx
server is behind a single 3
rd
-party NAT
firewall, the server’s Network Mode must be in LAN Host Mode. See Section 5.2, Network Mode: LAN Host.
When set to LAN Host Mode, the page contains a Public IP Address section as shown below: