Chapter 3. How Text Telephony Works

Text telephony provides a way for those with hearing and speech disabilities to interface with others using the public switched telephone network (PSTN). Users can type their conversations to one another instead of depending on hearing and speaking for communication. This makes text telephony an integral part of the growing trend of providing accessibility in IP telephony (IPT) environments to all users.

Accessibility in many cases is federally mandated here in the United States by legislation such as the Americans with Disabilities Act, Section 255 of the Telecommunications Act, and Section 508 of the Rehabilitation Act. This legislation helps to ensure that users who are hearing or speech disabled are afforded ...

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