A video conference is a set of interactive telecommunication technologies which allow two or more locations to interact via two way video and audio transmission simultaneously. It has also been called visual collaboration and is a type of groupware[1].It was only in the 1980s that digital telephony transmission networks became possible, such as ISDN, assuring minimum bite rate (usually 128 kilobit/s0 for compressed video and audio transmission. The first dedicated system, such as those manufactured by pioneering VTC firms, like Picture Tel, started to appear in the world. Video teleconference system throughout the 1990s rapidly evolved from highly expensive proprietary equipment, software and network requirements to the general public at a reasonable cost[2]. Finally, in the 1990s IP 9 internet protocol) based video conferencing became possible, and more efficient video compression technologies were developed, permitted desktop, or personal computer based video conferencing. In 1992 CU-See Me was developed at Cornell by Tim Dorcey et al., IVS was designated at INRIA, VTC arrived to the masses and free services, web plugins and software, such as Net Meeting,MSN Messenger, Yahoo Messenger, Sight Speed ,Skype and other brought cheap, albeit low-qulity, VTC.

[1] Fabio Giacomini and Mohd. Hasan Zaidi, Electronic Evidence (Lucknow: Alia Law Agency.), 107.

[2] Ibid.

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