docs/userguide/definemonitor/definemonitor_viewing.rst
ZoneMinder supplies its own RTSP server that can re-stream RTSP or attempt to convert the Monitor stream into RTSP. This is useful if you want to use the ZoneMinder Host machine resources instead of having multiple clients pulling from a single camera.
.. figure:: images/define-monitor-viewing.png
Monitor Viewing Tab
rtsp://ZM_HOST:20006/my_camera.