PBX in a Flash, trixbox and Elastix are open source user interfaces for the management and configuration of Asterisk PBXs. The Asterisk Admininistration GUI interface can differ depending on which version chosen. Using the Asterisk Administration Interface you can configure most of Asterisk's features without editing the actual command line configuration files. You can also setup advanced options like call routing, voicemail, and more via the GUI Interface. Below are some examples of common procedures you might require. You can download the Trixbox, Elastix, and PBX in a Flash software directly from their respective websites.