Design a complete Voice over IP (Vo IP) or traditional PBX system with Asterisk even if you have only basic telecommunications knowledge. This bestselling guide makes it easy with a detailed roadmap that shows you how to install & configure this open source software whether you're upgrading your existing phone system or starting from scratch. Ideal for Linux administrators developers & power users this updated edition shows you how to write a basic dialplan step-by-step & brings you up to speed on the features in Asterisk 11 the latest long-term support release from Digium. You'll quickly gain working knowledge to build a simple yet inclusive system. Integrate Asterisk with analog Vo IP & digital telephony systems Build an interactive dialplan using best practices for more advanced features Delve into voicemail options such as storing messages in a database Connect to external services including Google Talk XMPP & calendars Incorporate Asterisk features & functions into a relational database to facilitate information sharing Learn how to use Asterisk's security call routing & faxing features Monitor & control your system with the Asterisk Manager Interface (AMI) Plan for expansion by learning tools for building distributed systems