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In the 1980s, digital telephony transmission networks became possible, such as with ISDN networks, assuring a minimum bit rate (usually 128 kilobits/s) for compressed video and audio transmission.

During this time, there was also research into other forms of digital video and audio communication.

At the dawn of its commercial deployment from the 1950s through the 1990s, 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.

The development of advanced video codecs, more powerful CPUs, and high-bandwidth Internet telecommunication services in the late 1990s allowed videophones to provide high quality low-cost colour service between users almost anyplace in the world that the Internet is available.

A videophone is a telephone with a video display, capable of simultaneous video and audio for communication between people in real-time.

Videoconferencing implies the use of this technology for a group or organizational meeting rather than for individuals, in a videoconference.

It is also used in commercial and corporate settings to facilitate meetings and conferences, typically between parties that already have established relationships.This technique was very expensive, though, and could not be used for applications such as telemedicine, distance education, and business meetings.Attempts at using normal telephony networks to transmit slow-scan video, such as the first systems developed by AT&T Corporation, first researched in the 1950s, failed mostly due to the poor picture quality and the lack of efficient video compression techniques.However video technology was to be deployed in analog television broadcasting long before it could become practical—or popular—for videophones.During the first manned space flights, NASA used two radio-frequency (UHF or VHF) video links, one in each direction.

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