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TTY Resources

The Americans with Disabilities Act (ADA) of 1990 requires all interstate and intrastate telephone companies to provide Telecommunications Relay Services (TRS). Communication through TRS must be functionally equivalent to telecommunications services used by those who do have disabilities.

Telecommunication relay services enable persons with limited speech and/or hearing who use TTD's and TTY's, or TT's, to communicate by telephone with non-TTY users. (Source: National Institute on Disability and Rehabilitation Research)

Brad Marsh, former Assistive Technology Coordinator, with the Missouri AgrAbility Project, developed the following instructional presentation. The goal of this presentation is to educate all persons on the technology and services available to individuals with limited speech and/or hearing. Information is provided on the following:

  • What is TTY?
  • What are the functions of the TTY?
  • How do I prepare the TTY for use?
  • How do I recieve calls on the TTY>
  • How do I make telephone calls on the TTY?

Click to start the TTY Presentation


The Missouri AgrAbility Project and this product is supported by funds from the USDA National Institute of Food and Agriculture (NIFA) under Sponsor Project Number 2018-41590-22323.

Information is available in alternate formats upon request. Please call, 1-800-995-8503.

Missouri AgrAbility Project (MAP) Disclaimer:"The MAPs information comes from many sources, which are responsible for their accuracy and utility. Information accessed through the MAP does not imply endorsement. Questions regarding specific information should be directed to their respective sources."

Missouri AgrAbility Project Univeristy of Missouri Extension
University of Missouri Extension is an equal opportunity/ADA institution.