2010 ADA Standards for Accessible Design Pocket Guide

217.4.3.1 Public Buildings.

Where at least one public pay telephone is provided in a public building, at least one public TTY shall be provided in the building. Where at least one public pay telephone is provided in a public use area of a public building, at least one public TTY shall be provided in the public building in a public use area. [S.H. 4.1.3(17)(c)(i)], [S.H. 4.1.3(17)(d)]