Detailed instructions for installing and configuring software such as Asterisk and Freeswitch from scratch on Linux.  If you require our services please feel free to contact us via our contact form.

High Definition VoIP on Asterisk-FreePBX

Aastra 6739i SIP phoneA short guide on how to use High Definition VoIP on Asterisk and FreePBX.

What is it
HD VoIP in the Asterisk world involves selecting the g722 codec for VoIP calls.  g722 is known as a wideband codec as opposed to g711 which is narrowband.  The nice thing about it is that it does not require any more bandwidth than g711.  Both require 64kbit/s each way for a 2-way conversation.

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Asterisk/FreePBX on an OpenVZ/Virtuozzo Virtual Private Server (VPS)

OpenVZVirtuozzo

This install procedure can be used in a generic OpenVZ or Virtuozzo environment or inside an all in one OpenVZ installer+GUI product such as Proxmox VE.   It is the procedure used to create servers for our Asterisk hosting service.  I am not sure how relevant it would be for Xen.  This guide covers the installation INSIDE an already created OpenVZ/Virtuozzo container (VPS sans Operating System) which would then become a functioning Virtual Private Server (VPS).  I will not be covering the OpenVZ host setup or iptables or zaptel/dahdi setup inside or outside the OpenVZ environment.

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Solving problems with external SIP without losing your mind

External SIP or in other words SIP through firewalls and routers or more accurately SIP traversal through Network Address Translation (NAT) is arguably one of if not the most common problem people face.  SIP is notorious for this.  This little article is my attempt to provide a simple no nonsense method of finding and fixing these problems.  Ideally before they ever happen.  To keep it simple I will assume everything on the PBX itself is configured correctly. 

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Asterisk GUI Install Guide (CentOS v5.x, Asterisk v1.4.x, Asterisk GUI v2.x)

Includes every detail in the form of step by step instructions from bare metal to a running VoIP PBX in about 2 hours.  Because it does not require MySql or Apache, Asterisk GUI v2.x is a good alternative to FreePBX for someone looking for a less resource intensive install, possibly on a flash drive and/or embedded appliance hardware with limited CPU/RAM.  The whole install including source files takes up about 1.2Gigs of drive space and uses about 100MB of RAM while idle.  It could probably be reduced to 1Gig of drive space or less with very little effort.  Assuming you

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FreePBX Install Guide (CentOS v5.x, Asterisk v1.6.x, FreePBX)

Freepbx

UPDATED for Asterisk v1.6.2 and FreePBX v2.8

Includes every detail in the form of step by step instructions from bare metal to a running VoIP PBX in about 2 hours.

When installing Linux, do NOT install a GUI such as Gnome or KDE.  We only want to be running in console text mode not GUI graphics mode.  If you already have a desktop or server GUI installed you will want to exit to console mode.  You do that by typing init 3 from a terminal or console window.  You will need to be logged in as root in order to do this so if not you can su root.  All instructions in this guide are assuming you are always logged in as root.

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FreePBX, Asterisk and Linux Advanced Topics

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Here are a few advanced topics covering some things that can be done to any FreePBX or strictly Asterisk distribution.  These would be things one might be interested in doing beyond the standard Linux-Asterisk-Freepbx installation.

Aastra XML scripts part II, auto-provisioning and auto setup with RPMS

In previous posts I showed how to auto-provision and configure Aastra phones by manually installing XML scripts.  Aastra has released RPM packages for Trixbox that combines everything and adds new features as well as mDNS so the phones can find the TFTP server even if you don't have a DHCP server capable of assigning it.  The script won't install unless mDNS is installed. 

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The most common SNAFUs when planning and implementing an open source VoIP PBX rollout and how to avoid them

This is a general overview of some of the more common mile high mistakes people make when doing an open source VoIP PBX project.  I won't be going into details about hardware dimensioning or software configuration.  I will just be providing a general overview of some of the system level common sense mistakes people make in terms of a typical consultant/client type of project.

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