# asterisk

## Installing Dependencies
Before installing Asterisk, you need to update your package lists and install the necessary dependencies. Open your terminal and execute the following commands:

`sudo apt update`
`sudo apt upgrade`
`sudo apt install -y wget build-essential subversion`

## Downloading and Installing Asterisk
With the dependencies in place, you can now download and compile Asterisk:

`cd /usr/src`
`sudo wget http://downloads.asterisk.org/pub/telephony/asterisk/asterisk-18-current.tar.gz`
`sudo tar xvf asterisk-18-current.tar.gz`

Change into the extracted directory and install additional required packages:

`cd asterisk-18*`
`sudo contrib/scripts/install_prereq install`

Now, proceed to compile and install Asterisk:

`sudo ./configure`
`sudo make menuselect`
`sudo make`
`sudo make install`
`sudo make samples`
`sudo make config`
`sudo ldconfig`

With Asterisk installed, you can now set up its user and group permissions:

`sudo adduser --system --group --no-create-home asterisk`
`sudo chown -R asterisk:asterisk /etc/asterisk`
`sudo chown -R asterisk:asterisk /var/{lib,log,spool}/asterisk`
`sudo chown -R asterisk:asterisk /usr/lib/asterisk`

## Configuring Asterisk
Editing the main configuration file is the next step. Open it using your favorite text editor:

`sudo nano /etc/asterisk/asterisk.conf`

Make the necessary changes according to your setup, then start and enable Asterisk at boot:

`sudo systemctl start asterisk`
`sudo systemctl enable asterisk`

Ensure that Asterisk is running without issues:

`sudo asterisk -vvvr`

## Setting Up SIP Accounts
To handle VoIP calls, you need to set up SIP accounts. Edit the sip.conf and extensions.conf files:

`sudo nano /etc/asterisk/sip.conf`
`sudo nano /etc/asterisk/extensions.conf`

Add your SIP users in sip.conf and dial plan in extensions.conf.