have to buy expensive special hardware to run it5. The programmer's source code for Asterisk is freelyavailable, and there is a large community of people that can help you with Asterisk. You can, withoutspending any money at all, set up your own system and learn enough about Asterisk to help youradministrator, or even to become an Administrator (some people find it a lot of fun to administer theirown Asterisk installation at home). If you want to start learning more about Asterisk, you should readthe book Asterisk: The Future of Telephony. You can buy this book (Second Edition) at bookstores oronline, or you can download the PDF for free from AsteriskDocs.org.Asterisk can be administered either by editing textbased “configuration files” the geek way – or byusing one of several Webbased “GUI adminstration” tools for Asterisk. You can start either way, but ifyou really want to learn Asterisk well, you will someday need to get down to the raw configurationfiles.O'Reilly also publishes a book called VOIP Hacks, though I believe it's not exclusively about Asterisk.You can also get a lot of geeklevel information on Asterisk and VOIP at several “Wiki” sites aroundthe Internet, including the newer O'Reilly “etel wiki” at http://etel.wiki.oreilly.com/wiki/index.php/(particularly my article there for administrators,http://etel.wiki.oreilly.com/wiki/index.php/UsingNorteli2000Phones) and the more establishedhttp://www.voipinfo.org/wiki (particularly http://www.voipinfo.org/wikiAsterisk+UNISTIM+channels).Microsoft Windows). Asterisk is developed on Linux so that system has the most complete support.5 Though it's often a good idea to buy one or more of Digium's “line cards” to connect phone lines and/or analog phonesets; this is discussed in the Asterisk book mentioned above.12 Asterisk Unistim Revised 20080307