In 1968, Theodore George “Ted” Paraskevakos, while working as a communications engineer for SITA in Athens, Greece, began developing a system for automatically identifying a phone caller to a phone call recipient. After several trials and experiments, he developed the method by which the caller`s number was transmitted to the recipient`s device. This method served as the basis for modern caller identification technology. [Citation required] In 1977, Brazilian inventor Valdir Bravo Salinas filed a patent application with the Brazilian Patent and Trademark Office (INPI) for a caller identification device. The patent was granted in 1982 as patent PI7704466 and is the first patent granted for a caller identification device in Brazil. [Citation required] Later in 1980, two other Brazilian inventors, João da Cunha Doya and Nélio José Nicolai, filed patent applications for other caller identification devices. Doya`s application was filed on 2 It was filed on 1 May 1980 and was patented PI8003077. Nicolai`s application was filed on July 2, 1980 and dismissed because it was a copy of Salinas` invention. In 1981, José Daniel Martin Catoira and Afonso Feijó da Costa Ribeiro Neto filed another application for caller ID with the INPI. This application was granted and the patent was granted as patent PI8106464. [Citation required] Caller ID is a telephone service available in analog and digital telephone systems, including Voice over IP (VoIP), which transmits a caller`s phone number to the caller`s phone system when the call is set up.