@sadaman I have two questions, but let me start with a small correction.

Both HikVision KIS604 kits started working.

I can now make two-way audio communication from outside my home network.

It happened after installing the OC200 controller. The best part is I didn't have to change anything in the settings ... it just started working.

So the controller itself introduces / unlocks something that was responsible for this problem.

As for Large Ping, is there any way to disable the messages about this attack to eliminate their network impact?

As soon as the router notices them, it blocks the connection to the Internet.

On average, it takes up to 1 minute. Is there any way around it?

EDIT

  @sadaman Cool.

I unchecked the "Large ping" function and it seems that the internet loss problem is gone, but I will still watch :)

I will fill the ports on your advice.

I am still wondering where in the OC200 I can assign a fixed IP and device names in the LAN.

In the R605 it was possible to do it in the "Network> Lan> Address Reservation" tab, unfortunately I cannot find

such a possibility to assign a fixed IP and give my own name here.

EDIT