User`s guide

System Administrator’s Guide – Release 7.2.3.x

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Revised: September 1, 2010

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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.

14.3.1 Phone or Port Expander behind a 3

-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. Those steps are described below.

Most problems with firewalls are avoided by the system 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 allowing 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 this is done and the phone

or port expander is behind a firewall, some configuration of the firewall may be required.