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Building Telephony Systems With Asterisk

Barrie Dempster, David Gomillion

An easy introduction to using and configuring Asterisk to build feature-rich telephony systems for small and medium businesses.
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Book Details

ISBN 139781904811152
Paperback176 pages

About This Book

  • Install, configure, deploy, secure, and maintain Asterisk
  • Build a fully-featured telephony system and create a dial plan that suits your needs
  • Learn from example configurations for different requirements

Who This Book Is For

This book is aimed at anyone who is interested in building a powerful telephony system using the free and open source application, Asterisk, without spending many thousands of dollars buying a commercial and often less flexible system.

This book is suitable for the novice and those new to Asterisk and telephony. Telephony or Linux experience will be helpful, but not required.

Table of Contents

Chapter 1: Introduction to Asterisk
What is Asterisk?
What Asterisk Isn't
Is Asterisk a Good Fit for Me?
Chapter 2: Making a Plan for Deployment
The Public Switched Telephony Network (PSTN)
Terminal Equipment
How Much Hardware do I Need?
Choosing the Extension Length
Chapter 3: Installing Asterisk
Preparing to Install Asterisk
Obtaining the Source Files
Installing Zaptel
Installing libpri
Installing Asterisk
Getting to Know Asterisk
Chapter 4: Configuring Asterisk
Zaptel Interfaces
SIP Interfaces
IAX Interfaces
Music On Hold
Conference Rooms
Chapter 5: Creating a Dialplan
Creating a Context
Creating an Extension
Creating Outgoing Extensions
Advanced Call Distribution
Automated Attendants
System Services
Chapter 6: Quality Assurance
Call Detail Records
Monitoring Calls
Recording Calls
Legal Concerns
Chapter 7: Asterisk@Home
Preparation and Installation
A Simple One-to-One PBX
Customer Relationship Management/SugarCRM
Chapter 8: Case Studies
Small Office/Home Office
Small Business
Hosted PBX
Chapter 9: Maintenance and Security
Backup and System Maintenance
Asterisk Server Security
Host Security Hardening for Asterisk
Network Security for Asterisk
Asterisk Scalability
Support Channels for Asterisk

What You Will Learn

This book takes you from installing and configuring Asterisk to using its various advanced features�, helping you build feature-rich telephony systems. With this book, you will learn how to:


  • Install, configure, and deploy Asterisk
  • Create a dialplan that suits your needs
  • Build a fully-featured telephony system
  • Monitor, record, and log calls
  • Install and use Asterisk@Home
  • Backup, secure, and maintain Asterisk
  • Use example configurations for different requirements


In Detail

Asterisk is a powerful and flexible open source framework for building feature-rich telephony systems. As a Private Branch Exchange (PBX) which connects one or more telephones, and usually connects to one or more telephone lines, Asterisk offers very advanced features, including station-to-station calls, line trunking, call distribution, call detail rerecords, and call recording.

Asterisk can be used to provide Interactive Voice Response (IVR). The power and flexibility of a programmable phone system gives us the ability to respond to our customers in meaningful ways.

Asterisk has also a fully-functional voicemail system included. It supports voicemail contexts so that multiple organizations can be hosted from the same server.  It supports different time zones so that users can track when their phone calls come in.  It even provides the option to notify the recipient of new messages via email.  In fact, we can even attach the message in audio!

Finally, Asterisk is a Voice Over IP (VoIP) system. The benefits of VoIP are numerous. For instance, we can have multiple users using the same Asterisk service from a variety of locations; we can have users in the local office using PSTN phones or IP phones; we can have remote VoIP users; we can even have entire Asterisk systems operated and run completely separately but with integrated routing; We can have an extension anywhere we have a reasonably fast Internet connection, which means employees can have an extension on the phone system at home if they have a broadband connection. The benefits are too many to list.

Flexibility often means complexity, and this is true in the case of Asterisk. This book is all you need to understand and use Asterisk to build the telephony system that meets your need. You will learn how to use the many features that Asterisk provides you with.


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