C.R.S. § 40-17-102

As used in this article, unless the context otherwise requires: (1) “Commission” means the public utilities commission of the state of Colorado. (2) Repealed. (3) “Telecommunications relay services” means any telecommunications transmission services that allow a person who has a hearing or speech disability to communicate by wire or radio in a manner that is functionally equivalent to the ability of a person who does not have a hearing or speech disability. Such term includes any service that enables two-way communication between a person who uses a telecommunications device or other nonvoice terminal device and a person who does not use such a device. (4) “Telephone access line” means each voice grade channel or its equivalent assigned to a residential or commercial end user customer by a voice service provider, regardless of the technology used to provide the service. (5) “Voice service provider”means a company that provides telephone access lines to members of the general public who are its customers for voice service.