Teletypewriter [TTY]

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Also know as a Teletype, or text telephone, this is a device for text communication via a telephone line, used when one or more of the parties has hearing or speech difficulties.

Related Articles:
  • Glossary: Hearing Carry-Over [HCO]
    A call type method used by people who have difficulty speaking, but have no difficulty hearing voice. A less common call type than Voice Carry-Over (VCO), the HCO allows a speech-impaired person to type messages on a TTY (which are voiced by the relay operator) and then pick up the handset and listen to the other person's response.
  • 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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