As far as I know it's like a Chinese version of ONVIF - that is, a standard that if different devices conform to will give some degree of interoperability without having to have custom models for each product type. If that makes sense.
If that's the case I'm very confused as it is located in the network tab rather than the camera and it is auto populated with sip server credential (usually used for VoIP).
China mandatory national technical standard: GB/T 28181-2011
Overseen by: "National security alarm system Standardization Technical Committee"
Titled: "Security and protection video monitoring network system technical specification for information transport, switch and control"