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.
Table of Contents (23 chapters)
Title Page
Credits
About the Authors
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface

FreeSWITCH behind NAT


We have covered some of the common cases where your phone is behind NAT talking to FreeSWITCH who isn't. Now we can move on to cases where your local copy of FreeSWITCH is behind NAT and talking to a SIP provider or another FreeSWITCH server on the public Internet. Luckily, we have also dressed up the example configuration to have the best chance to work under these NAT circumstances. We recommend you try the unaltered example configuration on a test instance of FreeSWITCH every so often just to see if there are any more new default behaviors you may be missing out on.

FreeSWITCH speaks to the router

FreeSWITCH supports two client-side NAT-busting protocols by default called NAT-PMP and UPnP. Both of these protocols use slightly different methods but the basic gist is the same.

Both methods use a network protocol to discover your NAT router and communicate with it, so rather than making the NAT mappings on-the-fly, it asks the router to open a port and actually learns...