Tennessee Code Title 24. Evidence and Witnesses § 24-1-210

(1) “Dual party relay operator” means a person who facilitates communication over the telephone between persons, one (1) of whom depends on the use of a special device for transmitting text rather than the spoken voice through the telephone line; and

(2) “Interpreter” means a person who facilitates communication between persons who are unable to communicate with one another directly without such facilitation.