We haven't tested iCam with any Trust brand cameras personally, but iCamSource should work with any IP camera that outputs MJPEG or JPEG data over HTTP.
Have you tried using your camera with our free webcam video server software, iCamSource? If not, it's available here:
http://skjm.com/icam/support.phpIf you've already tried iCamSource, what is the exact URL are you entering into iCamSource?
Here is the MJPEG URL for the for Trust cameras:
http://xxx.xxx.xxx.xxx:yy/mjpeg.cgi - MJPEG mode
Where xxx.xxx.xxx.xxx is replaced with your camera's IP address and yy is replaced with your camera's port.
Have you tried that URL yet?
Regarding the cameras on two computers, try running only the iCamSource for the camera that doesn't show up. What error message do you see on the iPhone when you try to connect to it?