Asterisk Installation and Configuration

# yum install gcc bison flex bison-devel gcc-c++ ncurses-devel libxml2-devel make
# wget http://downloads.asterisk.org/pub/telephony/asterisk/releases/asterisk-1.8.8.0.tar.gz
# tar -xvzf asterisk-1.8.8.0.tar.gz && cd asterisk-1.8.8.0
# ./configure
# make
# make install
# make samples
# echo > /etc/asterisk/sip.conf
# echo > /etc/asterisk/extensions.conf
# vim /etc/asterisk/sip.conf

[general]  
port=5060
bindaddr=0.0.0.0

[1000]
type=friend
host=dynamic
secret=1000

[1001]
type=friend
host=dynamic
secret=1001


Note:- The general section contains main configurations for the asterisk server We have 2 users named 1000 and 1001 with type=friend which mean these users can call in and out, secret parameter is used to set password for that user

# vim /etc/asterisk/extensions.conf

[default]
exten => 999,1,Answer()
exten => 999,2,Playback(hello-world)
exten => 999,3,Hangup()
exten => 1000,1,Dial(SIP/1000)
exten => 1001,1,Dial(SIP/1001)  --> exten => 1000,1,Dial(SIP/User Name) for example if you dailed 1000 in will call user name 1000

Note:- syntax in the file take the following form exten => number that is dialed,step number,function
i.e dailing 999 follow 3 steps first answer, second playback recorded message "hello world" and third hang up.

Note:- These sounds and recorded messages can be found in /var/lib/asterisk/sounds/

# asterisk --> To start asterisk daemon
# asterisk -r
localhost*CLI> reload
localhost*CLI> exit

then use proper VoIP client to connect to the server with one user and dail the other user