In all compression modes driver uses RTSP/RTP/UDP/IP protocols for video receiving. HTTP protocol is used for parameters setting/retrieving.
If there is a firewall between VMS and the cameras, the following RTSP/UDP/HTTP ports must be opened:
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HTTP: default port is 80,
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RTSP: port 554,
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UDP: two sequential ports per video stream is needed in a port range 3556 to 4556.
For example: if there are 4 cameras in a VMS, then ports 3556, 3557, 3558, 3559, 3560, 3561, 3562 and 3563 will be used. If a port is not free, it will be skipped.
Limitations
Only primary video channel is supported (if camera has several channels)