Text telephony is a technology area that is unfamiliar to most people. Used by the hearing and speech impaired to communicate over the PSTN, this technology is becoming more prominent in today's IP world.

This chapter covered many aspects of text telephony. A brief history described the Weitbrecht modem, which allowed large discarded TTY machines to be used over the PSTN. Then, text telephone functions such as sending and receiving calls, conversation conventions, and TRS were covered.

Last of all, there was an in-depth look at the Baudot text protocol, the text telephony communication method for the United States and a few other countries. All the information in this chapter provides a firm foundation in the workings of text telephony before diving deeper in subsequent chapters and integrating text with IP.

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