Excluding all kinds of local broadband (ADSL or fttp) of Tietong and residential broadband, China Unicom or Telecom, remote monitoring can be done.

You can try to modify the port number of the video recorder, such as changing 80 to 8 1 and changing 8000 to 800 1. These two default ports will be blocked by operators in some areas and are not allowed to be used unregistered.