Leif Madsen first got involved with the Asterisk community when he was looking for a voice conferencing solution. Once he learned that there was no official Asterisk documentation, he co-founded the Asterisk Documentation Project. Leif is currently working at Thinking Phone Networks, leading the unified communications backend team. You can find out more about him at leifmadsen.com.
Russell Bryant is a Principal Software Engineer at Red Hat, where he works on the OpenStack project. Beginning in 2004 Russell spent seven years working for Digium on the Asterisk project. Russell's role at Digium began as a software developer and concluded as being the leader of the Asterisk Project and the Engineering Manager for the team focused on Asterisk development.

Design a complete Voice over IP (VoIP) 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 and configure this open source software, whether you're upgrading your existing phone system or starting from scratch.
Ideal for Linux administrators, developers, and power users, this updated edition shows you how to write a basic dialplan step-by-step, and 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, VoIP, and 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, and calendars Incorporate Asterisk features and functions into a relational database to facilitate information sharing Learn how to use Asterisk's security, call routing, and faxing features Monitor and control your system with the Asterisk Manager Interface (AMI) Plan for expansion by learning tools for building distributed systems