Need Help Modernising An Old Camera System

I was asked to help "modernise" an old camera system. The cameras are about about 10 years old (if not older). I can not see the exact model of the cameras, being that they are to high up. However, they are currenly hooked up to a Intellex DVR. Some a standard cameras while others are PTZ.

I have two thoughts on how to do this:

1 - The intellix has a network card put in (not hooked up). I see intellex has a windows client, so maybe I would install it on a windows machine. The question is it compatible with all models of Intellix? Also, they want remote viewing, does intellix do that properly?

2 - Hook up a modern NVR to encoder cards like Avigilon and use that as the NVR. THe question is are the modern encoders compatible with the cameras, especially the PTZ ones.

Any help would me appreciated.

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