28 CFR Part 35 Nondiscrimination on the Basis of Disability in State and Local Government Services (2010 ADA Title II Regulations with amendments issued through Aug. 2016)

(b) When a public entity uses an automated-attendant system, including, but not limited to, voice mail and messaging, or an interactive voice response system, for receiving and directing incoming telephone calls, that system must provide effective real-time communication with individuals using auxiliary aids and services, including TTYs and all forms of FCC-approved telecommunications relay system, including Internet-based relay systems.