2010 ADA Standards for Accessible Design Pocket Guide

217.4.3 Building Requirement.

TTYs in public buildings shall be provided in accordance with 217.4.3.1. TTYs in private buildings shall be provided in accordance with 217.4.3.2.

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)]

217.4.3.2 Private Buildings.

Where four or more public pay telephones are provided in a private building, at least one public TTY shall be provided in the building. [S.H. 4.1.3(17)(c)(i)], [S.H. 4.1.3(17)(d)]