In 1971, Paraskevakos, working with Boeing in Huntsville, Alabama, constructed and reduced to practice a transmitter and receiver, representing the world's Talking Caller ID first prototypes of caller identification devices. They were installed at Peoples' Telephone Crew in Leesburg, Alabama and were demonstrated to indefinite telephone companies with gigantic success. These original and historic working models are still in the possession of Paraskevakos.

To look up the name associated with a phone number, the carrier in some instances dead duck to access that erudition from a third party database and some database providers sortie a small fee for each access to such databases. For 800 numbers, they may report a string such as "TOLLFREE NUMBER" if the name is not applicable in a database.