I’ve started a book writing project (that I should start years ago -_-). Begins with the need to provide a companion materials for Asterisk training, this, hopefully, should end as a complete Asterisk 101 book.
Described on its website, Asterisk is an open source framework for building communications applications. Asterisk turns an ordinary computer into a communications server. Asterisk powers IP PBX systems, VoIP gateways, conference servers and other custom solutions. It is used by small businesses, large businesses, call centers, carriers and government agencies, worldwide.
Asterisk 101 means the book contains basic, if not fundamental, stuffs that someone should learn if they need to operate Asterisk properly.
The book project is hosted at Github, here: https://github.com/antonraharja/book-asterisk-101
Short URL: http://bit.ly/asterisk101
Asterisk project website is http://www.asterisk.org
Do interfere, please fork the project, send your pull-requests, edit the wiki and email me for any suggestions (or even requests).