https://tdiforaccess.org

TDI (formally known as Telecommunications for the Deaf and Hard of Hearing, Inc. ) was established in 1968 originally to promote further distribution of TTYs in the deaf community and to publish an annual national directory of TTY numbers. Today, it is an active national advocacy organization focusing its energies and resources to address equal access issues in telecommunications and media for people who are deaf, hard-of-hearing, late-deafened, and deaf-blind.