N.Y. General Business Law § 336-B
* § 336-b. Public pay telephone volume controls. 1. Each telephone corporation doing business in this state which provides public pay telephones, including those owners or providers of customer owned currency operated telephones (COCOT's), shall provide at least twenty-five percent of its public pay telephones installed on or after January first, nineteen hundred ninety-three with volume control equipment to enable deaf or hard of hearing persons to access and utilize telecommunications services. The telephones with volume control equipment shall be distributed evenly among the public pay telephones provided by the corporation. Each public pay telephone with a volume control shall have signage either on the telephone or in the immediate vicinity thereof, identifying that telephone as being equipped with a deaf or hard of hearing volume control.