Text Telephones (TTY) or Telecommunications Devices for the Deaf (TDD):
TTYs, also called TDDs, are devices that allow individuals who are unable to use a regular telephone to make or receive telephone calls by enabling them to type their conversations. The TTY benefits people who are deaf, hard of hearing, or speech impaired and individuals seeking to communicate with them. The conversation is typed back and forth and is displayed on a lighted display screen, a paper print-out in the TTY/TDD device, or a computer screen using specialized TTY software. A TTY may also be used to place a relay call to a party with a regular telephone. See Chapter 4, Section D.
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