I-View FDMO-2MIP-20XIR IP SpeedDome Network Camera - Manual (Page 38)

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Device Port: If there is a router and you want to access the speed dome
through Wide Area Network (WAN), you need to forward the 3 ports for the
IP Camera. Click this button to modify the HTTP (Default is 80), RTSP
(Default is 554) or Control Port number (Default is 60000) and click Save
to change the setting.
QoS: Click this button to adjust the QoS (Quality of Service) volume and it
can help solve the network delay and network congestion by configuring the
priority of data sending the audio and video and control command. The
valid DSCP value ranges from 0 to 63. The DSCP value is bigger, the
priority is higher. Click Save to change the setting.
Make sure that you enable the QoS function of your network device (such as
a router) and it will ask for a reboot for the settings to take effect.