【Catalogue】Guo Lao Er's Blog Post: Summary of Images and Videos
1. Brief introduction of GB28181
The GB28181 protocol refers to the national standard GB/T 28181-2016 "Public Security Video Surveillance Networking System Information Transmission, Exchange, and Control Technical Requirements".
This standard stipulates the interconnection structure of the public security video surveillance networking system, the basic requirements and security requirements for transmission, exchange, and control, as well as the technical requirements for control, transmission process, and protocol interface. It is a national standard in the field of video surveillance.
信令通道：使用的是SIP（Session Initiation Protocol）协议。
媒体通道：使用的是实时传输协议（Real-time Transport Protocol，RTP）协议。
Therefore, it can be understood that GB28181 is modified on the basis of international general standards.
2. GB28181 agreement
Reference blog: https://zhuanlan.zhihu.com/p/545703291
1. Brief introduction of SIP
SIP is an interactive user session, which is used to create, modify, and terminate audio and video instant communication;
SIP protocol will work with many other protocols, such as SIP message content sending Session Description Protocol (Session Description Protocol, SDP), The SDP protocol describes the details of the streaming media used by the session, such as: which IP port to use, which codec to use, and so on.