VIDEO TELEPHONY.

This article presents information about video telephony. With the recent advances in modem technology and audio and video compression, real-time transmission of video and audio over the telephone network, also known as general switched telephone network or Public Switched Telephone Network, is possible. Modern voice compression techniques allow the transmission of speech at a rate of about 6-8 kbits/s with a quality that is comparable to that of 64 kbits/s pulse code modulation which is used in standard digital telephone networks.