ভিডিও কনফারেন্সিং এ কোন প্রটোকল ব্যবহৃত হয়?

The major protocols that have been used or are being used for video conferencing are the H. 323 protocol and the Session Initiation Protocol (SIP). The session parameters and control of incoming and outgoing signals is done at this layer.
Source: engineersgarage.com