Fax, Modem, and Text for IP Telephony

Chapter 2. How Fax Works

With the advent of IP telephony (IPT), fax technology became meshed with a transport path quite different from a traditional public switched telephone network (PSTN) environment. However, the basic rules and specifications of standard fax technology still apply to fax over an IP network. This merging of an old and new technology makes it imperative for anyone working with fax technology in today’s IPT world to have a fundamental grasp of basic fax principles.

The focus of this chapter revolves around Group 3 (G3) fax technology and messaging. The G3 fax standard ensures worldwide interoperability among fax devices from different vendors. This chapter covers the following topics:

• A Brief History of Fax: Provides a historical ...