The Telephone Consumer Protection Act of 1991 (TCPA) was passed by the United States Congress in 1991 and signed into law by President George H. W. Bush as Public Law 102-243. It amended the Communications Act of 1934. The TCPA is codified as 47 U.S.C. 227. The TCPA restricts telephone solicitations (i.e., telemarketing) and the use of automated telephone equipment. The TCPA limits the use of automatic dialing systems, artificial or prerecorded voice messages, SMS text messages, and fax machines. It also specifies several technical requirements for fax machines, autodialers, and voice messaging systems—principally with provisions requiring identification and contact information of the entity using the device to be contained in the message.