Following up on this:
Back on site today. I determined I was able to run a cable to a nearby outlet to provide power. I terminated only pins 1,2,3 + 6 of both ends of the existing cable using the 2 undamaged pairs. Connected to camera + DVR before plugging in 12V power supply. Camera worked(with no power supply connected). I called ICRealtime - they insisted all 8 conductors are required for PoE - clearly this is not the case.