The remote video conferencing system uses transmission lines and multimedia equipment to simultaneously transmit audio, video and document materials, enabling real-time and interactive communication to achieve the purpose of the meeting. 

Basic functions: 

1. Basic audio and video communication: Supports multi-party real-time audio and video communication, enabling people in different locations to have "face-to-face" conversations. 

2. Document sharing: Participants are allowed to share and view documents, images, and other materials, facilitating discussions and collaboration. 

3. Electronic Whiteboard and Annotation: Offers the electronic whiteboard function, supporting online annotation and collaboration among multiple users, facilitating the presentation and discussion of project details. 

4. Meeting Recording and Playback: The meeting process can be recorded, which facilitates review and learning after the meeting. 

5. Remote Control: Supports control of remote devices, facilitating operations such as remote training and technical support.