The typical structure is:
rtsp:<ip>/1/h264<stream ID>
The default credentials are:
User: admin
Password: N/A
Practical examples:
Main stream: rtsp://192.168.1.18/1/h264major
Sub-stream: rtsp://192.168.1.18/1/h264minor
MJPEG: rtsp://192.168.1.18/1/mjpeg