Documentation:
Asterisk overview
http://voip-info.org/wiki/view/Asterisk
Asterisk page on www.voip-info.org 		 
Asterisk Glossary
http://www.asterisk.org/glossary
Glossary of Asterisk Terms 		 
Digium Documentation Support & Troubleshooting Guides
http://www.digium.com/en/supportcenter/document...
View product faq, data sheets and literature, technical whitepapers, installation guides, sample configuration files and related data. Documentation is in HTML, PDF, TXT and tarball format. 		 
Asterisk Knowledge Base
http://kb.digium.com/
 		 
Asterisk: The Future of Telephony
http://downloads.oreilly.com/books/978059651048...
Second Edition ebook 		 

 

 
Useful Links:
VOIP-Info
http://voip-info.org/
An amazingly complete reference guide to all things VOIP 		 
Asterisk user contributed links
http://www.asterisk.org/support/#user_links
Excellent list of user-supplied links 		 
AsteriskNOW Version 1.4.0 Beta 1
http://www.asterisknow.org/
AsteriskNOW™ Beta is a Software Appliance; a customized Linux distribution that includes Asterisk, the Asterisk GUI, and all other software needed for an Asterisk system. 		 

 

 
Training:
Step-by-Step: How to Get Started with Asterisk
http://www.voip-news.com/feature/step-by-step-a...