Are you talking about IP cameras? as in CCTV cameras that you would normally view on a webpage?

There is no way to view these directly in catalyst, but you could bring them up in a webpage on another machine and send the output of that machine into catalyst using a Epiphan USB Capture device.

Catalyst can control Sony EVI-D70 and BRC 300 cameras. You can add a Netcom IP serial adaptor at the camera end run your network to it, and send the camera VISCA commands directly from catalyst to control all the camera functions. The camera can then run into your decklink/lfg4/phoenix card and appear in catalyst as a live input.

I've done this on tour last year and it worked quite successfully.

Paul