Telephone Consumer Protection Act
(d) Technical and procedural standards
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It shall be unlawful for any person within the United States—
to initiate any communication using a telephone facsimile machine, or to make any telephone call using any automatic telephone dialing system, that does not comply with the technical and procedural standards prescribed under this subsection, or to use any telephone facsimile machine or automatic telephone dialing system in a manner that does not comply with such standards; or
(B) to use a computer or other electronic device to send any message via a telephone facsimile machine unless such person clearly marks, in a margin at the top or bottom of each transmitted page of the message or on the first page of the transmission, the date and time it is sent and an identification of the business, other entity, or individual sending the message and the telephone number of the sending machine or of such business, other entity, or individual.
(2) Telephone facsimile machines
The Commission shall revise the regulations setting technical and procedural standards for telephone facsimile machines to require that any such machine which is manufactured after one year after December 20, 1991, clearly marks, in a margin at the top or bottom of each transmitted page or on the first page of each transmission, the date and time sent, an identification of the business, other entity, or individual sending the message, and the telephone number of the sending machine or of such business, other entity, or individual.
(3) Artificial or prerecorded voice systems
The Commission shall prescribe technical and procedural standards for systems that are used to transmit any artificial or prerecorded voice message via telephone. Such standards shall require that—
(A) all artificial or prerecorded telephone messages
(i) shall, at the beginning of the message, state clearly the identity of the business, individual, or other entity initiating the call, and
(ii) shall, during or after the message, state clearly the telephone number or address of such business, other entity, or individual; and
(B) any such system will automatically release the called party’s line within 5 seconds of the time notification is transmitted to the system that the called party has hung up, to allow the called party’s line to be used to make or receive other calls.