AVTECH AVC794 not reachable via Internet

[ddfra 0]

Hello everybody,

I have an avtech avc794 dvr and I can't reach it via internet.

I'm able to access it via local network through the ip 192.168.1.10.

When I browse the modem settings pages I can't find it in the connected devices list.

My modem doesn't allow to do forwarding by manually entering the destination ip address, but just selecting a device from the list.

If I enter the device settings manually (ip and mac addresses) and then enter the port forwarding rule, that settings go away after few seconds.

It seems like something is wrong with the dvr settings, like it's telling the modem to be not recognized.

Can somebody help me through it?

Thank you in advance