47 U.S. Code § 617 - Access to advanced communications services and equipment
With respect to equipment manufactured after the effective date of the regulations established pursuant to subsection (e), and subject to those regulations, a manufacturer of equipment used for advanced communications services, including end user equipment, network equipment, and software, shall ensure that the equipment and software that such manufacturer offers for sale or otherwise distributes in interstate commerce shall be accessible to and usable by individuals with disabilities, unless the requirements of this subsection are not achievable.
With respect to services provided after the effective date of the regulations established pursuant to subsection (e), and subject to those regulations, a provider of advanced communications services shall ensure that such services offered by such provider in or affecting interstate commerce are accessible to and usable by individuals with disabilities, unless the requirements of this subsection are not achievable.
Whenever the requirements of subsections  (a) or (b) are not achievable, a manufacturer or provider shall ensure that its equipment or service is compatible with existing peripheral devices or specialized customer premises equipment commonly used by individuals with disabilities to achieve access, unless the requirement of this subsection is not achievable.
Each provider of advanced communications services has the duty not to install network features, functions, or capabilities that impede accessibility or usability.
The Commission shall issue prospective guidelines for a manufacturer or provider regarding the requirements of this section.
The requirements of this section shall not apply to any equipment or services, including interconnected VoIP service, that are subject to the requirements of section 255 of this title on the day before October 8, 2010. Such services and equipment shall remain subject to the requirements of section 255 of this title.
The Commission may exempt small entities from the requirements of this section.
The provisions of this section shall not apply to customized equipment or services that are not offered directly to the public, or to such classes of users as to be effectively available directly to the public, regardless of the facilities used.
This section shall not be construed to require a manufacturer of equipment used for advanced communications or a provider of advanced communications services to make every feature and function of every device or service accessible for every disability.
 So in original. Probably should be “subsection”.
 So in original. Probably should be “subsections”.
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