A search on Internet gives that people use this URL rtsp://username:password@IPADDRESS:554/h264_vga.sdp for connection to software. I know that this camera is a little bit difficult and I am not sure if you also get the audio. Do the following:
-add the camera with the tab for Custom URL.
-set stream type to rtsp_tcp or rtsp_udp.
-address is rtsp://username:password@cameraIP:554/h264_vga.sdp
If you buy a new camera make sure it support the standard called ONVIF since it is more easy to connect it to NCS.