Telecommunications Device for the Deaf [TDD]

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An electronic device for text communication via a telephone line, used when one or more of the parties has hearing or speech difficulties.

Related Articles:
  • Glossary: Telecommunication Relay Services [TRS]
    Also known as a Relay Service, or IP-Relay, this is an operator service that allows individuals who are deaf, hard-of-hearing, speech-impaired, and speech-disabled to place calls to standard telephone users via TDD, TTY, personal computer or other assistive telephone device.
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