An excerpt from Autodialers Under the Telephone Consumer Protection Act: Will there be Certainty Soon? (Part 1):
(First in a Series on the TCPA's ATDS Definition)
"The Telephone Consumer Protection Act of 1991 ('TCPA') protects consumers from unwanted nuisance calls by limiting the use of an automatic telephone dialing system ('ATDS') or prerecorded calls. Since its enactment, courts and the FCC have been battling over the definition of an ATDS." Read in its entirety here.