QNAP Security VioStor NVR (Version: 3.3.2) - Manual (Page 138)

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6.3.5 Protocol Management
To connect to the NVR by a specific HTTP port number, enable the option ‘Specify HTTP port
number’ and enter the port number. The default setting is 80.
RTP (Real-time Transfer Protocol) is a standardized packet format for delivering real-time
audio and video data of the IP cameras on the Internet. The real-time data transfer is
monitored and controlled by RTP (also RTCP). The default setting is 6100–6299. If your
IP cameras use different RTP ports, enable ‘Specify RTP port range’ and specify the port
numbers.
Note: Make sure you have opened the ports configured on the router or firewall to ensure
normal monitoring and recording.