Leif Madsen

Current

VoIP Engineer at Digium
Owner at LeifMadsen Enterprises, Inc.
Technical Writer at O'Reilly Media, Inc.

Consultant at Core Telecom Innovations Inc.

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Recommended

4 people have recommended Leif

Connections

208 connections

Industry

Telecommunications

Websites

Leif Madsen’s Summary

* More than five years full time experience with Asterisk and Voice over Internet Protocol (VoIP) technologies (first started using Asterisk late 2001)
* Heavily involved with the organization and production of AstriCon, a conference dedicated to Asterisk and related technologies.
* Instructor of courses dealing with Asterisk and it's related technologies
* Proctor of Digium Certified Asterisk Professional certification
* Development and deployment of SOAP enabled proxy server and GUI portal for E911 solution for an ITSP
* Development of ITSP backend based on Asterisk and her related technologies focusing on large scale deployment by developing a clustered system with heavy use of replicated databases to create a peer-to-peer, decentralized environment with self-healing network technologies
* Co-Author of O'Reilly published, Asterisk: The Future of Telephony (1st and 2nd Editions)
* Founder of the Asterisk Documentation Project

Leif Madsen’s Specialties:

Specializing in large scale deployments of Asterisk by utilizing various tools within the software to create a decentralized, clustered solution to scale simply with the addition of more nodes to process calls.

Leif Madsen’s Experience

VoIP Engineer

Digium

(Privately Held; 51-200 employees; Telecommunications industry)

July 2007 — Present (2 years 1 month)

Digium acquired Sokol & Associates in June of 2007, at which point they offered positions to all consultants (all of whom were subsequently hired). I am now working with the Custom Development team at Digium who do consulting and custom development work and integration with the Asterisk platform.
Owner

LeifMadsen Enterprises, Inc.

(Privately Held; Myself Only; Telecommunications industry)

August 2005 — Present (4 years)

All consulting work performed by myself is performed under the company name of LeifMadsen Enterprises, Inc.
Technical Writer

O'Reilly Media, Inc.

(Privately Held; 51-200 employees; Telecommunications industry)

January 2005 — Present (4 years 7 months)

In this position I am a co-author of Asterisk: The Future of Telephony, the first widely distributed book on the Asterisk PBX system. This book is an introduction to the software, and includes a brief history of the software, obtaining, compiling, and configuring the software for the SIP and IAX2 protocols, & Zaptel hardware. It then delves into how analog and digital communications differ, a look into the authors predictions to where the software and industry as a whole is headed, as well as an extensive reference manual.

A second edition is due for release in August of 2007. I am also participating in the creation of the Asterisk Cookbook, a public effort being written at http://www.asteriskcookbook.com.

Information about Asterisk: The Future of Telephony is available at http://www.oreilly.com/catalog/asterisk/
Consultant

Core Telecom Innovations Inc.

(Privately Held; 1-10 employees; Telecommunications industry)

May 2004 — Present (5 years 3 months)

I originally started working with Core Telecom Innovations by getting my start in the telecommunications field by performing work for a major bank in downtown Toronto by modifying the physical layer of the phone system.

From there as I've expanding into my own consulting business, Core Telecom Innovations and LeifMadsen Enterprises have had a strong business relationship which has benefited both companies. Ideas freely flow between the companies and I consider the people who work at Core Telecom Innovations personal friends.