Videotelephony, the general technology describing all aspects of live audio-video telecommunications
At the dawn of the technology, videotelephony also included image phones which would exchange still images between units every few seconds over conventional POTS-type telephone lines, essentially the same as slow scan TV systems.
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The development of the crucial video technology first started in the latter half of the 1920s in the United Kingdom and the United States, spurred notably by John Logie Baird and AT&T's Bell Labs.
a contemporary UMTS-type Mobile phone, a form of videotelephony that can convey simultaneous audio and video, or