Book Image

Mastering FreeSWITCH

By : Russell Treleaven, Seven Du, Darren Schreiber, Ken Rice, Mike Jerris, Kalyani Kulkarni, Florent Krieg, Charles Bujold
4 (1)
Book Image

Mastering FreeSWITCH

4 (1)
By: Russell Treleaven, Seven Du, Darren Schreiber, Ken Rice, Mike Jerris, Kalyani Kulkarni, Florent Krieg, Charles Bujold

Overview of this book

FreeSWITCH is one of the best tools around if you’re looking for a modern method of managing communication protocols through a range of different media. From real-time browser communication with the WebRTC API to implementing VoIP (voice over internet protocol), with FreeSWITCH you’re in full control of your projects. This book shows you how to unlock its full potential – more than just a tutorial, it’s packed with plenty of tips and tricks to make it work for you. Written by members of the team who actually helped build FreeSWITCH, it will guide you through some of the newest features of version 1.6 including video transcoding and conferencing. Find out how FreeSWITCH interacts with other tools and APIs, learn how to tackle common (and not so common) challenges ranging from high availability to IVR development and programming advanced PBXs. Great communication functionality begins with FreeSWITCH – find out how and get your project up and running today.
Table of Contents (21 chapters)
Mastering FreeSWITCH
About the Authors
About the Reviewers
WebRTC and Mod_Verto

What is Fax on PSTN?

Fax is scanning an image at one end of the communication, and sending the result to the other end, where it will be transformed back into an image.

However impossible it might seem, faxing was invented and patented before voice telephony. The first commercial faxing service was introduced in 1865 between Paris and Lyon. The first desktop fax machine for end users was introduced in 1948, while the 80s saw mass market distribution of compact fax machines very similar and completely compatible with today's models.

Every office still has a fax machine, or a fax server. Modern faxing is governed by the International Telecommunication Union (ITU) standard T30, which is ubiquitous, very reliable (that is, 99% or better completion rates between fax machines connected to PSTN), and is required by law for many legal document transmissions in many countries.

How it works

On a standard PSTN-transmitting fax machine, an image is scanned, the result is converted into TIFF digital image...