FreePBX
FreePBX is an open source GUI (graphical user interface) that controls and manages Asterisk (PBX)
Official website: http://freepbx.org
How to install FreePBX:
http://wiki.freepbx.org/display/HTGS/Installing+FreePBX+2.11+on+Centos+6.3
Once FreePBX is installed you can access it with your browser using the following link:
http://yourIPaddress/admin
How to change admin password:
- Go to Admin -> Administrators
How to create sip account:
- Go to Applications -> Extensions
For more details refer to the documentation: http://www.freepbx.org/support/documentation