LevelOne NVR-0216 - Manual (Page 80)

80 NVR-02 Series User Manual
Define which system events should trigger the recorder to send out
notifications.
Define how the notifications will be sent and where they will be sent to.
* Event trigger may not work for cameras that are placed outside of
your local network or on the Internet until the “UPnP Port Forwarding”
is enabled in both the NVR and the router.