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FreeSWITCH 1.8

By : Giovanni Maruzzelli, Anthony Minessale II

3 (9)

FreeSWITCH 1.8

3 (9)

By: Giovanni Maruzzelli, Anthony Minessale II

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.

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

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

Building and Installation

Building and Installation

Where to Install FreeSWITCH

Installing FreeSWITCH

Summary

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

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

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

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

Phrase Macros and XML IVRs

Phrase Macros and XML IVRs

Phrase Macros and Voice Prompts

XML IVRs

Summary

Lua FreeSWITCH Scripting

Lua FreeSWITCH Scripting

Many scripting languages

Basic Lua syntax

Lua and FreeSWITCH

Lua scripting IVR Applications

Summary

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

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

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

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

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

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

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

Troubleshooting, Asking for Help, and Reporting Bugs

Troubleshooting, Asking for Help, and Reporting Bugs

Troubleshooting FreeSWITCH

Asking for Help

Reporting Problems

ClueCon

Summary

Reporting Problems

What if you hit a bug? First of all try to understand if actually you hit a FreeSWITCH bug. Check all the things around FreeSWITCH that can be cause of malfunctioning: network, firewalls, databases, upstream and downstream providers, etc. OK, let's say you checked it all.

Then, download and install latest stable FreeSWITCH version. You will be asked: "is this problem affecting latest stable?". If you're unable to answer "yes" (and give proof of it), your problem will not get any attention (maybe is fixed in latest stable).

Then, do the same with latest development version of FreeSWITCH, called "MASTER". "is this problem affecting master?" Be ready to answer this question too. If is solved in master, then the fix will be backported to stable, if that's possible at all.

...

CONTINUE READING

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Tech Concepts

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Programming languages

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