Video conferencing and telephony

Video conferencing (VCS) is a telecommunication technology for the interactive interaction of three or more remote subscribers, in which it is possible between them to exchange audio and video information in real time, taking into account the transfer of control data.

IP telephony. IP telephony means a set of communication protocols, technologies and methods that provide traditional telephony dialing, dialing and two-way voice communication, as well as video communication over the Internet or any other IP networks. The signal through the communication channel is transmitted in digital form and, as a rule, is converted (compressed) before transmission in order to remove the redundancy of information and reduce the load on the data transmission network.