Such an antecedent usually consisted of two closed-circuit television systems connected via coax cable or radio.An example of that was the German Reich Postzentralamt (post office) video telephone network serving Berlin and several German cities via coaxial cables between 19.
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.
Although not as widely used in everyday communications as audio-only and text communication, useful applications include sign language transmission for deaf and speech-impaired people, distance education, telemedicine, and overcoming mobility issues.
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Videoconferencing implies the use of this technology for a group or organizational meeting rather than for individuals, in a videoconference.
Telepresence may refer either to a high-quality videotelephony system (where the goal is to create the illusion that remote participants are in the same room) or to meetup technology which goes beyond video into robotics (such as moving around the room or physically manipulating objects).During this time, there was also research into other forms of digital video and audio communication.Many of these technologies, such as the Media space, are not as widely used today as videoconferencing but were still an important area of research.Only in the late 20th century with the advent of powerful video codecs combined with high-speed Internet broadband and ISDN service did videotelephony become a practical technology for regular use.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.It is also used in commercial and corporate settings to facilitate meetings and conferences, typically between parties that already have established relationships.