In 1978, researchers were conducting early experiments in group teleconferencing using packet switching over the ARPANET, which became the basis of the Internet. These "packet speech systems" evolved into the VoIP that we know and love (?) today. Above is a 1979 video from the USC Information Sciences Institute of an experiment involving a "dramatization" of a group teleconference. As /r/ObscureMedia user jetRink posted, "The meeting participants are late, unprepared and frustrated, the audio quality is terrible and nothing is accomplished except the scheduling of another meeting."
Just like today!
For more on this, see Stanford University professor Robert Gray's "History of LPC Digital Speech and its impact on the Internet Protocol."