Introduction

Do It Yourself an IPPBX.

This article is divided into three parts:

• Part 1: Prepare The Server
• Part 2: Install Asterisk 11
• Part 3: Install FreePBX 12

The goal is to get the PC provides Private Branch eXchange services, a phone system, using Free and Open Source Software.

Part 1: Prepare The Server

Linux CentOS 6.7 Minimal

Linux server installation:

• You may use VirtualBox or any other virtualization software, or a real server
• You need fast Internet connection, we will be downloading lots of stuffs from the server
• Install CentOS 6.7 minimal version, get minimal version of ISO here
• Configure the network so that the server will have access to the Internet
• Access the server using SSH, work from outside
• You will need to login as root during installation

Suggestion on partition layout:

• 4GB for /
• 1GB for swap
• the rest of available space for /var

Update CentOS and install basic system config tools:

yum update
yum install system-config-firewall system-config-firewall-tui system-config-network-tui system-config-network
reboot

Please note that the reboot command is essential.

Development Packages

Install development packages:

yum install wget perl subversion gcc gcc-c++ make kernel-devel ncurses-devel newt-devel mysql-devel openssl-devel libxml2-devel zlib-devel curl-devel speex-devel unixODBC-devel libtool-ltdl-devel sqlite-devel

Web and Database Server

Install Apache2 web server and MySQL database server:

yum install httpd mysql-server mysql php php-mysql php-gd php-cli php-pear php-posix php-xml php-mbstring
chkconfig httpd on
chkconfig mysqld on
/etc/init.d/httpd start
/etc/init.d/mysqld start

Server Init

Follow all instructions to initialize your server.

Disable Firewall

Disable firewall from system config tool:

system-config-firewall

Please note that you can enable the firewall again later after successful installation.

Disable SELINUX

Edit /etc/sysconfig/selinux and change SELINUX=enforcing to SELINUX=disabled:

vi /etc/sysconfig/selinux

Configure Web Server

Add user for Asterisk and change files ownership:

useradd asterisk
chown asterisk.asterisk -R /var/www/html /var/lib/php

Edit /etc/httpd/conf/httpd.conf and change these optios:
– User and Group setting, go to line 242-243 and change User apache to User asterisk and Group apache to Group asterisk
– Allow access .htaccess, go to line 338 change AllowOverride None to AllowOverride All

vi /etc/httpd/conf/httpd.conf
/etc/init.d/httpd restart

Make sure the web server run as user asterisk:

ps aux | grep httpd

Configure Database Server

Set root password for MySQL database server, in this example we will use simple password password:

/etc/init.d/mysqld restart
mysqladmin -uroot -p password 'password'

Please note that the initial password for MySQL server is empty, just press ENTER.

Part 2: Install Asterisk 11

Download Source Codes

Prepare sources directory in /root/src, in there we will gather all software source codes:

mkdir -p /root/src
cd ~/src

Get the latest Asterisk, current release is Asterisk 11.21.1:

wget -c http://downloads.asterisk.org/pub/telephony/asterisk/releases/asterisk-11.21.1.tar.gz

Get the latest PRI library, current release is libpri 1.4.15:

wget -c http://downloads.asterisk.org/pub/telephony/libpri/releases/libpri-1.4.15.tar.gz

Get the latest Asterisk hardware drivers, current release is dahdi 2.11.0:

wget -c http://downloads.asterisk.org/pub/telephony/dahdi-linux-complete/dahdi-linux-complete-2.11.0+2.11.0.tar.gz

Get Secure RTP library, we will be using SRTP 1.4.2:

wget -c http://srtp.sourceforge.net/srtp-1.4.2.tgz

Compile and Install SRTP

Install Secure RTP library:

cd ~/src
tar -zxf srtp-1.4.2.tgz
cd srtp
./configure CFLAGS=-fPIC
make
make runtest
make install
ldconfig
cd ../

Compile and Install DAHDI

Install Asterisk hardware drivers DAHDI:

cd ~/src
tar -zxf dahdi-linux-complete-2.11.0+2.11.0.tar.gz
cd dahdi-linux-complete-2.11.0+2.11.0
make all
make install
make config
cd ../

Please note that DAHDI must be installed before libpri and Asterisk.

Compile and Install libpri

Install PRI library:

cd ~/src
tar -zxf libpri-1.4.15.tar.gz
cd libpri-1.4.15
make
make install
ldconfig
cd ../

Compile and Install Asterisk

Only after SRTP, DAHDI and libpri then we can install Asterisk:

cd ~/src
tar -zxf asterisk-11.21.1.tar.gz
cd asterisk-11.21.1
./contrib/scripts/get_mp3_source.sh
./configure
make menuselect

Inside make menuselect you may choose which packages you want to install or remove.

Here is the recommended options:

• Add-ons tab select chan_ooh323, format_mp3 and cdr_mysql
• Applications tab select app_meetme
• Core Sound Packages tab select EN WAV, ULAW, ALAW, GSM, G729, G722, SLN16
• Music On Hold File Packages tab select EN WAV, ULAW, ALAW, GSM, G729, G722, SLN16
• Extras Sound Packages tab select EN WAV, ULAW, ALAW, GSM, G729, G722, SLN16

Please note that sound files and music on hold files are essential, but the selection type can be minimized into just EN WAV, GSM and G729.

Continue to compile and install Asterisk:

make
make install
make samples
chown asterisk.asterisk -R /etc/asterisk /var/lib/asterisk /usr/lib/asterisk /var/log/asterisk
cd ../

Please note that most Asterisk installation howto will suggest you to install init script for Asterisk but not this time. Since we will be installing FreePBX as well the start and stop script will be handled by amportal, the init script from FreePBX.

Part 3: Install FreePBX 12

Download Source

Get the current stable release of FreePBX, FreePBX 12:

cd ~/src
wget -c http://mirror.freepbx.org/modules/packages/freepbx/freepbx-12.0-latest.tgz

FreePBX Dependencies

Add databases and install PEAR-DB 1.7.14:

mysqladmin -uroot -p create asterisk
mysqladmin -uroot -p create asteriskcdrdb
pear install db-1.7.14

Please note that the PEAR-DB version must be 1.7.14. The latest version of PEAR-DB cannot be used by FreePBX 12.

FreePBX Installation

Install FreePBX, pay attention to details, you will be asked several important questions and you must answer them correctly:

cd ~/src
tar -zxf freepbx-12.0-latest.tgz -C /var/
chown asterisk.asterisk -R /var/freepbx

Asterisk must be running during FreePBX installation. FreePBX provides a script to run the Asterisk:

cd /var/freepbx
./start_asterisk restart
ps aux | grep asterisk

Remove existing /var/www/html otherwise the install script will fail. You can explicitly remove the directory or just move it somewhere:

mv /var/www/html /var/www/html.orig

Continue to install FreePBX:

cd /var/freepbx
./install_amp --installdb --cleaninstall --install-moh
cd ../

After installation process the server must be configured to start amportal on boot and rebooted.

Insert /usr/local/sbin/amportal start at the bottom of /etc/rc.local:

echo '/usr/local/sbin/amportal start' >> /etc/rc.local

Last step, reboot the server:

reboot

Please note that the server reboot is required.

FreePBX Setup

Open browser and browse the server’s IP address to login to FreePBX. Create the admin username and password for FreePBX, login as admin user and hit the red Apply Config button on top.

At this point the IPPBX is ready, but before proceeding with other configuration we should consider to update the FreePBX first. Visit Module Admin menu from the Admin tab, and then hit the Check Online button. To continue the update process click the Upgrade all button followed by Process button.

IPPBX installation finished.

Author

This howto is written by Anton Raharja and at some point edited and double-checked by Asoka Wardhana.