Book Image

FreeSWITCH 1.2 - Second Edition

Book Image

FreeSWITCH 1.2 - Second Edition

Overview of this book

FreeSWITCH is an open source telephony platform designed to facilitate the creation of voice and chat-driven products, scaling from a soft-phone to a PBX and even up to an enterprise-class soft-switch. It is always exciting to design and build your own telephony system to suit your needs, but the task is time-consuming and involves a lot of technical skill."FreeSWITCH 1.2" comes to your rescue to help you set up a telephony system quickly and securely using FreeSWITCH. It is rich with practical examples and will give you all of the information and skills needed to implement your own PBX system.You will start with a detailed description of the FreeSWITCH system architecture. Thereafter you will receive step-by-step instructions on how to set up basic and advanced features for your telephony platform.The book begins by introducing the architecture and workings of FreeSWITCH before detailing how to plan a telephone system and then moves on to the installation, configuration, and management of a feature-packed PBX. You will learn about maintaining a user directory, XML dial plan, and advanced dial plan concepts, call routing, and the extremely powerful Event Socket. You will finally learn about the online community and history of FreeSWITCH."FreeSWITCH 1.2" is an indispensable tool for novice and expert alike.
Table of Contents (24 chapters)
FreeSWITCH 1.2
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
Index

Dialstring formats


Before we leave our discussion of the Dialplan, it would be good to consider one more topic: Dialstrings. A Dialstring is exactly what it sounds like—a string of characters that defines a destination to be dialed by FreeSWITCH. All Dialstrings have a specific syntax. The syntax varies depending upon the type of Endpoint being dialed. The most important types of Dialstring in FreeSWITCH are those for Sofia, because they represent how we dial SIP Endpoints. However, as we will see, there are several different kinds of Dialstrings. They are used primarily in two places, which are as follows:

  • Bridging an existing call leg in the Dialplan with the bridge application

  • Creating a new call leg at the CLI with the originate command

Tip

Dialstring syntax is the same whether using the bridge dialplan application or the originate API command.

Let's learn a bit more about Dialstrings by considering a few examples, starting with some Sofia Dialstrings. The basic Sofia Dialstring takes two...