Thanks Nayr. From the number of postings on the subject, there seems to be a lot of confusion on the relationship between cameras, NVRs and client software. Clearly a configuration could have one, two or all three. I see postings saying that motion detection has to be enabled on the NVR, but no region selected, then set up line crossing on the cameras. It doesn't seem intuitive and the HikVision manuals do not discuss this. Is there a definitive guide to how the cameras, NVRs and client software work together and how the important functions such as motion detection, VCA and scheduling should be set up? At least with an all HikVision systems, one would hope there is some integration. When I read postings that contradict what you've said yet the poster is successful, it leaves me wondering whether they got it to work but didn't really understand how. I am finding it quite confusing, poking around with settings until I get something to work rather than truly understanding the fundamentals of what's happening. As an example, right now I am struggling to get tampering to send me an email by any means. I've followed the manual but there must be a combination of requirements that I don't have set up properly. I am leaving the country to install a system in a few days and I feel like I'm brute forcing it to work by luck rather than understanding.