I will cut him some slack, I always set up my cams to the NVR beforehand and burn them in. When i go to the site at least i know everything works before I get there. BTW, before I go to the site, I would have already have visited that site most likely a few times and prepared a plan on networking, tcpip scheme and the goals of the end user, cam locations ..it goes on and on. I usually use NVR's with built in POE to keep the routing off existing equipment. In house IT people do NOT like the camera guy encroaching on their networks so I usually try to keep it as private as possible(as far as the networking goes). Their is NO way you can predict a outcome if you are adding IP cameras to a existing network BUT if you do your homework ahead of time about what already in place, you can get a general feel of the outcome ...in other words..it looked good on paper.