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

Dialplan functions


Dialplan functions are small pieces of functionality that run real-time when processing Dialplan conditions. They can be used to gain a little more control and flexibility when writing your condition statements.

Dialplan functions can actually be used elsewhere—not just in the Dialplan. They are not related to XML—they can be used anywhere that a FreeSWITCH string processor is invoked. Examples of other places they may appear include external scripts that execute and set variables, bridge and transfer applications, and so on.

The general format for Dialplan functions is:

${api_func(api_args ${var_name})}

Where the api_func function is the name of the Dialplan function, api_args is the name of the arguments to pass to the function, and ${var_name} is an optional variable name to pass to the function. The format and expected parameters for api_args vary depending on the function being used. Each available Dialplan function is explained in more detail in the following sections...