Indiana Code Title 8. Utilities and Transportation § 8-1-2.8-3

Sec. 3. (a) As used in this chapter, “dual party relay services” means telecommunications transmission services that provide the ability for a person who has a hearing impairment or speech impairment to engage in communication with a hearing person in a manner that is functionally equivalent to the ability of an individual who does not have a hearing impairment or speech impairment to communicate using voice communication services.

(b) The term includes services that enable two-way communication between a person who uses a telecommunications device for individuals who are deaf or other nonvoice terminal and a person who does not use such a device.