Book Image

FreeSWITCH 1.8

By : Anthony Minessale II, Giovanni Maruzzelli
Book Image

FreeSWITCH 1.8

By: Anthony Minessale II, Giovanni Maruzzelli

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. This book introduces FreeSWITCH to IT professionals who want to build their own telephony system. This book starts with a brief introduction to the latest version of FreeSWITCH. We then move on to the fundamentals and the new features added in version 1.6, showing you how to set up a basic system so you can make and receive phone calls, make calls between extensions, and utilize basic PBX functionality. Once you have a basic system in place, we’ll show you how to add more and more functionalities to it. You’ll learn to deploy the features on the system using unique techniques and tips to make it work better. Also, there are changes in the security-related components, which will affect the content in the book, so we will make that intact with the latest version. There are new support libraries introduced, such as SQLite, OpenSS, and more, which will make FreeSWITCH more efficient and add more functions to it. We’ll cover these in the new edition to make it more appealing for you.

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FreeSWITCH 1.8
Anthony Minessale II | Giovanni Maruzzelli
Jul, 2017 | 434 pages
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Table of Contents (23 chapters)
Title Page
Title Page
Credits
Credits
About the Authors
About the Authors
About the Reviewer
About the Reviewer
www.PacktPub.com
www.PacktPub.com
Customer Feedback
Customer Feedback
Preface
Preface
Free Chapter
1
Architecture of FreeSWITCH
Architecture of FreeSWITCH
Real-time communication without mysteries
The FreeSWITCH design - modular, scalable, and stable
Important modules - Endpoint and Dialplan
Complex applications made simple
Summary
2
Building and Installation
Building and Installation
Where to Install FreeSWITCH
Installing FreeSWITCH
Summary
3
Test Driving the Example Configuration
Test Driving the Example Configuration
Important concepts to understand
FS_CLI and Console, Controlling FreeSWITCH
Configure SIP and make the first calls in demo dialplan
Summary
4
User Directory, SIP, and Verto
User Directory, SIP, and Verto
User Directory concepts
AAA: Authentication, Authorization, Accounting
Exploring and Using the Demo Example User Directory
Communicate with the World via SIP Gateways and DIDs
Summary
5
WebRTC, SIP, and Verto
WebRTC, SIP, and Verto
WebRTC concepts
Encryption Everywhere
WebRTC in FreeSWITCH
Installing and Configuring WebRTC in FS
Writing WebRTC Clients
WebRTC Rooms, both SIP and Verto Clients
Summary
6
XML Dialplan
XML Dialplan
Forget all you know
Contexts
Extensions
Conditions (and "patterns")
Call legs (channels)
Channel Variables
Regular Expressions
Actions and anti-actions
How dialplan processing works
Important dialplan applications
Dialstring formats
Summary
7
Phrase Macros and XML IVRs
Phrase Macros and XML IVRs
Phrase Macros and Voice Prompts
XML IVRs
Summary
8
Lua FreeSWITCH Scripting
Lua FreeSWITCH Scripting
Many scripting languages
Basic Lua syntax
Lua and FreeSWITCH
Lua scripting IVR Applications
Summary
9
Dialplan in Deep
Dialplan in Deep
Where are the previous Dialplan seasons?
XML Dialplan Recap
More about conditions
Pitfalls to avoid
Variables
API commands from Dialplan
FreeSWITCH string interpreter functions
"Hotkeys", Listening, Barging
Dialplan Cookbook
Summary
10
Dialplan, Directory, and ALL via XML_CURL and Scripts
Dialplan, Directory, and ALL via XML_CURL and Scripts
mod_xml_curl rationale
mod_xml_curl configuration
mod_xml_curl: Caveats and Pitfalls
php/mysql setup for mod_xml_curl
Lua XML handler
Summary
11
ESL - FreeSWITCH Controlled by Events
ESL - FreeSWITCH Controlled by Events
Event System Fundamentals
Event format - Headers and Body
Event Handling modules
Event System Commands
Outbound Socket - call connects to you
ESL - Event Socket Library
ESL Reference
ESL installation
ESL: Examples in Perl
Summary
12
HTTAPI - FreeSWITCH Asks Webserver Next Action
HTTAPI - FreeSWITCH Asks Webserver Next Action
HTTAPI Rationale
HTTAPI dialplan
HTTAPI document syntax
mod_httapi configuration file
HTTPAPI libraries for PHP and Python
The demo-ivr in PHP-HTTAPI
Summary
13
Conferencing and WebRTC Video-Conferencing
Conferencing and WebRTC Video-Conferencing
Conferencing Concepts
Conferencing Support in FreeSWITCH
Audio Conferencing setup in FreeSWITCH
Video-WebRTC conferencing setup in FreeSWITCH
FreeSWITCH conferencing operation
Verto Communicator and Video-WebRTC Conferencing
Summary
14
Handling NAT
Handling NAT
A brief introduction to NAT
The four pitfalls of NAT
Demystifying NAT settings in FreeSWITCH
Making media flow
Advanced options and settings
FreeSWITCH behind NAT
Other creative uses of FreeSWITCH in a NAT situation
NAT and WebRTC (SOLVED)
Conclusion
Summary
15
VoIP Security
VoIP Security
Network level protection
Intrusion detection
Encryption in non-WebRTC SIP: Signaling and Media
Protecting WebRTC SIP and VERTO Signaling and Media
Protecting passwords
Summary
16
Troubleshooting, Asking for Help, and Reporting Bugs
Troubleshooting, Asking for Help, and Reporting Bugs
Troubleshooting FreeSWITCH
Asking for Help
Reporting Problems
ClueCon
Summary

Lua XML handler

Exactly in the same vein as mod_xml_curl, you can have FreeSWITCH retrieve its XML configuration snippets by executing a script in one of the supported scripting languages.

You must first configure the scripting language module, in this case mod_lua, to handle XML lookup requests for a class of XML snippets.

Then you create a script that sets a variable named XML_STRING, containing the XML snippet.

That's it. Because lua is embedded in FreeSWITCH (as python and perl) there is no need for anything else.

You would connect to databases, webservers, do your data massaging, and so on from the script itself. The script is just supposed to return a string containing the XML snippet. With any means necessary.

This example Lua script can be configured as xml-handler-script, it sets the variable XML_STRING to the XML document FreeSWITCH is looking for:

lua xmlhandler script

xml_snippet = [[ 
<?xml version="1.0" encoding="UTF-8" standalone="no"?> 
<document type="freeswitch/xml"&gt...
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