I have cams quite similar to yours, just server's version is V1.2.1040-20171026-HDXP2P-GEN
They give out (by default) main channel via rtsp://admin:admin@192.168.1.217:554/mpeg4/ch0/main/av_stream and secondary one via rtsp://admin:admin@192.168.1.217:554/mpeg4/ch0/sub/av_stream