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About the Authors

About the Authors

Barrie Dempster is currently employed as a Senior Security Consultant for NGS Software Ltd., a world-renowned security consultancy well known for its focus on enterprise‑level application vulnerability research and database security.

He has a background in Infrastructure and Information Security in a number of specialized environments such as financial services institutions, telecommunication companies, call centers, and other organizations across multiple continents.

Barrie has experience in the integration of network infrastructure and telecommunications systems requiring high caliber secure design, testing, and management. He has been involved in a variety of projects from the design and implementation of internet banking systems to large-scale conferencing and telephony infrastructure, as well as penetration testing and other security assessments of business-critical infrastructure.

Kerry Garrison has been in the IT industry for over 20 years with positions ranging from IT Director of a large multi-site distribution company to developing a large hosted web server platform for a major ISP, to finally running his own IT consulting business in Southern California.

Kerry was introduced to the world of Asterisk by a friend and began running his own business on it. After about a year of working with it and writing some articles that became extremely popular on the net, he felt it was time to start putting clients onto Asterisk-based systems. Today, Asterisk PBX systems represent a significant portion of his business revenue.

Kerry has spoken at Astricon and does a regular seminar series in California. He is also the publisher of both http://voipspeak.net and http://asterisktutorials.com. He is very active with the Asterisk and FreePBX community and has even contributed modules to the FreePBX project.

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