Is there any way to use Kerui alarms with their servers?

I would like to install an IP camera with a Kerui alarm but I do not want any external servers accessing my camera. Is this possible?

I would like to retain app control of the system if possible, but as I understand it they only offer disarm/arm, so it's not essential as I can do the same via remote or sms.

I would much prefer to set up a direct IP or dynamic DNS connection and save data to a local server/NAS. If it operates both via direct connection and server, I am perfectly fine blocking server access via the router firewall.

Thanks.