HOWTO Setup A Remote SIP Extension
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This HOWTO assumes that your FreePBX system is sitting behind a NATed firewall with no direct connection to the outside world and it is NOT in the DMZ zone. If you are relying on this article to set-up your system, DO NOT place your system on a public IP address or a DMZ zone. This article does not address the potential security implications involved in such a setup.
The four key considerations in setting up remote extensions are:
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FreePBX Users & Devices
About Device & User Mode
By default, FreePBX operates in "Extension Mode." In Extension Mode, devices (such as phones) and users (people) both use the same identification number, i.e. their extension number. Each Device (Phone) is assigned one User (Extension) and they cannot be easily changed, without accessing the FreePBX User Interface. A single module, entitled "extensions" will appear on the left hand side of the FreePBX interface, and all settings relating to both the phone and the user will appear in the same place.
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Voicemail Module
The Voicemail Module is a required for the system to work properly. For
that reason, once installed it can not be un-installed. This module
provides the functionality to the Extensions or Users Page to configure
Voicemail. It also provides the Feature Codes used to dial into a users
Voicemail box.
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Adding Extensions
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Adding Extensions
A PBX without any extensions isn't very useful, so it's the first thing to do after installing FreePBX. Extensions let you test all kinds of things, so it's the first thing to get right.
Shown at right are a few test extensions on a FreePBX installation on my t42 Ubuntu laptop.
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Extensions
Information
This area is for handsets, softphones, paging systems, or anything
else that could be considered an 'extension' in the classical PBX
context.
Overview
Defining and editing extensions is probably the most common task
performed by a PBX administrator, and as such, you'll find you'll
become very familiar with this page. There are presently four types of
devices supported - SIP, IAX2, ZAP and 'Custom'. This page also
configures how voicemail is handled on a per-extension basis.
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