Bit of a strange situation , the milestone licence is split between various sites and the installer (not us) didn’t purchase the correct amount of licenses. So they need to buy a new copy of mile stone and a new licence for every camera. The cost is coming in a lot larger than the budget allows.
I’ve gone through the cameras and can’t find any onvif settings. The cameras are about 14 years old so I fear they pre date onvif but hik have said they may still work , but I can’t see a way how.