“A small step for man, but a giant leap for mankind”, such were the words that travelled through space all the way from the Moon to our television sets as frames of Armstrong’s setting foot on the moon flashed across 600 million screens. It was indeed a technological milestone. But have ever wondered that people were sitting in their living rooms watching a mortal reach an alien land and show to you live pictures from there. Much before that feat, the technology to transmit video had been developed and was in itself a technological achievement. About half a century later, two-way communication involving real-time streaming of video and audio is becoming commonplace with almost every smart phone.

Components of a V. C. system
Components of a Generic Video Conferencing System:
Classification
Classification of Video Conferencing Systems:
Architecture
Architecture of Video Conferencing System:

Protocols
Popular Protocols:

Fig. 4: A Figure Demonstrating Session Border Controller for NAT Traversal and a Gateway to Interface the SIP Networks to Other Network
Network Topologies
Network Topologies of Videoconferencing Systems:
Standards
Standards for Video Conferencing:
Issues in Implementation
Issues in Implementation:
Applications & Conclusion
Applications:
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