GRA-CO

Hi, I currently have 6 AVTECH 16 CH 960H DVR'S at various installations, and I would like to stay with the same software for viewing on my PC,s and iPhone's. I want to install a new AVTECH AVH317 16CH 1080p Push Video NVR. Can I use any type IP camera or do I have to use AVTECH only brand cameras? My future cameras are model--IC-ILDMVW25-AH2: --1/3’ Omnivision 2MP CMOS Sensor --OV2710+Hi3518C --vandalproof & waterproof --built-in 3-Axis bracket --2.8-12mm 3MP varifocal lens --30pcs IR LEDs --IR distance:25m --0 lux with IR on --waterproof:IP66 I can't seem to find much info on the Avtech AVH317 NVR as to it working with other brands. And before I purchase the 16 port switch and NVR I want to see if they will work together. I really don't want to reinvent the wheel. Thank you,