28 CFR Part 36 Nondiscrimination on the Basis of Disability by Public Accommodations and in Commercial Facilities NPRM (2008 Title III NPRM)

(2) Text telephones (TTYs).

(i) A public accommodation that offers a customer, client, patient, or participant the opportunity to make outgoing telephone calls on more than an incidental convenience basis shall make available, upon request, a TTY for the use of an individual who is deaf or hard of hearing, or has a speech impairment. 

(ii) This part does not require a public accommodation to use a TTY for receiving or making telephone calls incident to its operations.

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