User guide

System Administrator’s Guide – Release 7.5
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Toll Free 1-866-ALLWORX • 585-421-3850 • www.allworx.com
Revised: April 9, 2013
Page 144
To enter the Boot Server IP and Plug ’n’ Play Secret Key into the phone, press the
Config softkey and choose the Network Settings menu. To enter the information into
an Allworx PX 6/2 Expander, enter Config Mode. See the Allworx PX 6/2 Expander
Installation Guide for more information.
17.1.1 Phone or Port Expander behind a 3rd-Party Firewall
Remote phones and port expanders usually work well, even if they are behind a
firewall. There are several exceptions, each of which requires additional configuration
steps. This document describes the steps below.
Avoid most problems with firewalls by routing remote audio traffic through the server.
By default, all audio traffic from remote phones and port expanders runs through the
Allworx server. Although this avoids problems, it uses up bandwidth of the network
connection to the server. When calls to and from remote devices go back out over SIP
trunks or over the internet to other remote devices, the bandwidth usage is 180 Kbytes
per call, double that of a regular incoming call.
This traffic can degrade the audio quality of calls that use the Internet. However, there
is a server setting that can reduces the effect by enabling audio between devices to go
directly from one to the other, rather than through the server. The setting is Force
Remote Phone audio through server which can be found on the Servers > VoIP page.
Disabling it will reduce server bandwidth usage. However, if doing this and the phone
or port expander is behind a firewall, some configuration of the firewall may be
required.