Comelit MT IPNVR116A - Manual (Page 24)

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5.3.1.1 Advanced setting
Set advanced configuration parameters on the "Advance" interface, as shown in the
below picture:
1) Administer main machine to realize DVR register to the servers automatically
2) Enable PPPOE function to achieve NVR dialing
3) Click "
√
" in front of " Enable UPnP"
，
and setup HTTP port and TCP port it can match
successfully, notice the port number can not conflict with other devices.