Install Asterisk EPABX-VOIP

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Configuring an Asterisk PBX (EPABX) system involves several steps, from installation to setting up extensions, trunks, and call routing. Below is a step-by-step guide to setting up Asterisk PBX on a Linux system (e.g., Ubuntu or CentOS).

Step 1: Install Asterisk

1. Update System Packages

bash
sudo apt update && sudo apt upgrade -y   # For Debian/Ubuntu
sudo yum update -y                        # For CentOS/RHEL

2. Install Required Dependencies

bash
sudo apt install -y build-essential wget curl git subversion libjansson-dev \
libxml2-dev libsqlite3-dev uuid-dev

(For CentOS, use yum instead of apt.)

3. Download and Compile Asterisk

bashcd /usr/src/
sudo wget http://downloads.asterisk.org/pub/telephony/asterisk/asterisk-20-current.tar.gz
sudo tar -xvzf asterisk-20-current.tar.gz
cd asterisk-20.*

4. Install Required Modules

bash
sudo contrib/scripts/get_mp3_source.sh
sudo contrib/scripts/install_prereq install

5. Configure & Compile Asterisk

bash
sudo ./configure
sudo make menuselect
  • Enable the necessary modules (like chan_sip, res_config_mysql, app_macro, etc.).
  • Exit and save.
bashsudo make -j$(nproc)
sudo make install
sudo make samples
sudo make config
sudo ldconfig

Step 2: Configure Asterisk PBX

1. Configure SIP Extensions

Edit the SIP configuration file:

bashCopyEditsudo nano /etc/asterisk/sip.conf

Add the following sample configuration:

ini[general]
context=default
allowguest=no
srvlookup=yes
udpbindaddr=0.0.0.0
tcpenable=no

[1001]
type=friend
secret=yourpassword
host=dynamic
context=internal
nat=yes
canreinvite=no
disallow=all
allow=ulaw
allow=alaw
callerid="User 1001" <1001>

[1002]
type=friend
secret=yourpassword
host=dynamic
context=internal
nat=yes
canreinvite=no
disallow=all
allow=ulaw
allow=alaw
callerid="User 1002" <1002>

2. Configure Extensions (Dial Plan)

Edit the dial plan:

bash

sudo nano /etc/asterisk/extensions.conf

Add the following:

iniCopyEdit[internal]
exten => 1001,1,Dial(SIP/1001,20)
exten => 1002,1,Dial(SIP/1002,20)

exten => _X.,1,NoOp(Incoming call)
 same => n,Answer()
 same => n,Playback(hello-world)  ; Play a sample message
 same => n,Hangup()

3. Configure Trunks (Optional)

For a SIP trunk:

ini[voiptrunk]
type=peer
host=sip.provider.com
username=yourusername
secret=yourpassword
insecure=invite
nat=yes
canreinvite=no
context=from-trunk

Step 3: Start and Enable Asterisk

bash
sudo systemctl restart asterisk
sudo systemctl enable asterisk

Step 4: Test & Connect Softphones

  1. Install Zoiper or Linphone on your PC or mobile.
  2. Add an account:
    • SIP Server: IP_of_Asterisk_Server
    • Username: 1001
    • Password: yourpassword
  3. Try calling 1002 from 1001.

Step 5: Monitor & Debug

Run Asterisk CLI:

bash

sudo asterisk -rvvv


Check logs:
bashCopyEdittail -f /var/log/asterisk/full

Additional Features

  1. Voicemail – Configure /etc/asterisk/voicemail.conf
  2. IVR Menus – Configure extensions.conf
  3. Call Recording – Configure features.conf
  4. Call Queues – Configure queues.conf

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