I could get working the rtsp stream with ffplay 'ffplay -i rtsp://cameraIP/stream1' or 'ffplay -i rtsp://cameraIP/stream1' maybe you'll get able to get informations about the stream with ffplay or even with sniffing the packets with wireshark
How did you configure it into zoneminder please?? Had a bad moment for getting it into DHCP mode, getting the rtsp address, port and stream addresses, still doesn't work into my zoneminder... only with ffplay, even vlc cant play it