Leif Madsen

Leif Madsen

Asterisk Consultant, Author

  • @leifmadsen

Caledon, Ontario

Areas of Expertise:

  • asterisk
  • clustering
  • call-centre
  • call-center
  • dialplan
  • queues
  • odbc
  • func_odbc
  • consulting
  • speaking
  • programming
  • writing
Leif Madsen first took an interest in Asterisk while attempting to find a voice conferencing solution for him and his friends. After someone suggested trying Asterisk, the obsession began. Wanting to contribute and be involved with the community, and noticing the lack of Asterisk documentation, he co-founded the Asterisk Documentation Project. Leif is currently working as a consultant, specializing in Asterisk clustering and call-centre integration. You can get more information at http://www.leifmadsen.com

Asterisk: The Definitive Guide Asterisk: The Definitive Guide
by Russell Bryant, Leif Madsen, Jim Van Meggelen
Fourth Edition May 2013
Print: $54.99
Ebook: $46.99

Asterisk: The Definitive Guide Asterisk: The Definitive Guide
by Jim Van Meggelen, Leif Madsen, Russell Bryant
Third Edition April 2011
OUT OF PRINT

Asterisk Cookbook Asterisk Cookbook
by Leif Madsen, Russell Bryant
April 2011
Print: $29.99
Ebook: $16.99

Asterisk: The Future of Telephony Asterisk: The Future of Telephony
by Jim Van Meggelen, Jared Smith, Leif Madsen
Second Edition August 2007
Ebook: $35.99

Asterisk: The Future of Telephony Asterisk: The Future of Telephony
by Jared Smith, Jim Van Meggelen, Leif Madsen
September 2005
OUT OF PRINT

Leif blogs at:

Four short links: 22 May 2015

May 22 2015

GM: That Car You Bought, We’re Really the Ones Who Own It — GM’s claim is all about copyright and software code, and it’s the same claim John Deere is making about their tractors. The TL;DR version of the argument … read more

Four short links: 22 May 2015

May 22 2015

GM: That Car You Bought, We’re Really the Ones Who Own It — GM’s claim is all about copyright and software code, and it’s the same claim John Deere is making about their tractors. The TL;DR version of the argument … read more

A “have-coffee” culture

May 21 2015

Download a free copy of Building an Optimized Business, a curated collection of chapters from the O’Reilly Web Operations and Performance library. This post is an excerpt by J. Paul Reed from DevOps in Practice, one of the selections included … read more

A “have-coffee” culture

May 21 2015

Download a free copy of Building an Optimized Business, a curated collection of chapters from the O’Reilly Web Operations and Performance library. This post is an excerpt by J. Paul Reed from DevOps in Practice, one of the selections included … read more

Cultivating change

May 21 2015

Attend Cultivate July 20 and 21, in Portland, Oregon. Cultivate is our conference looking at the challenges facing modern management and aiming to train a new generation of business leaders who understand the relationship between corporate culture and corporate prosperity. … read more

What today’s fitness technology means for tomorrow’s office

May 21 2015

Contributing Author: Claire Niech Attend O’Reilly’s Solid Conference, June 23–25, in San Francisco. Solid is our conference exploring how the collision of software and hardware is fueling the creation of a software-enhanced, networked physical world. At 5:37 a.m., Nina’s alarm … read more

Cultivating change

May 21 2015

Attend Cultivate July 20 and 21, in Portland, Oregon. Cultivate is our conference looking at the challenges facing modern management and aiming to train a new generation of business leaders who understand the relationship between corporate culture and corporate prosperity. … read more

What today’s fitness technology means for tomorrow’s office

May 21 2015

Contributing Author: Claire Niech Attend O’Reilly’s Solid Conference, June 23–25, in San Francisco. Solid is our conference exploring how the collision of software and hardware is fueling the creation of a software-enhanced, networked physical world. At 5:37 a.m., Nina’s alarm … read more

Toward a damned good information architecture

May 21 2015

Download a free copy of “The New Design Fundamentals” ebook, a curated collection of chapters from our Design library. Note: this post is an excerpt from “Information Architecture,” 4th Edition, by Louis Rosenfeld, Peter Morville, and Jorge Arango, which is … read more

Data science makes an impact on Wall Street

May 21 2015

Having started my career in industry, working on problems in finance, I’ve always appreciated how challenging it is to build consistently profitable systems in this extremely competitive domain. When I served as quant at a hedge fund in the late … read more