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TTY-based Telecommunications Relay Services permit persons with a hearing or speech disability to use the telephone system via a text telephone (TTY) or other device to call persons with or without such disabilities.
TTY relay service is offered to all home phone subscribers in Canada. In a TTY relay service call, a person with a hearing or speech disability uses a TTY and dials 7-1-1 to reach a relay operator. A TTY is a telephone-typewriter hybrid that transmits text-based messages to another TTY over the telephone network. Conversely, the other party may call the person with a disability by dialing a toll-free number (1-800-855-0511) to reach a TTY relay operator.