connect with another person that has a TDD or use a relay service that can convert the text into voice for the hearing listener receiving the call. With the
device. Originally, relay services were designed to be connected through a TDD, teletypewriter (TTY) or other assistive telephone device. Services gradually
people with hearing or speech impairments. This can best be achieved with input from end-users in the development stages. Interworking between TDDs and ToIP
company (telco) customer service and repair 711: TDD and Relay Services for the deaf and hard of hearing 811: Underground public utility location (United