I don’t know if I can post this here, but I recently wrote up 3 tutorials for installing and configuring Asterisk on Ubuntu 13.04.
Anyways here they are.
Installing Asterisk
draalin.com/installing-asterisk-in-ubuntu/
A basic Asterisk configuration (Only works locally ex: 192.168.1.0/24 network)
draalin.com/basic-asterisk-confi … in-ubuntu/
A advanced Asterisk configuration (Works globally with a Vo-IP provider setup)
draalin.com/advanced-asterisk-co … in-ubuntu/
I put a lot of detail in these so most people who are familiar with a command line should be able to complete these fairly easily.