I worry about phoning home if the company goes offline. When phoning home, sniff the packets. I wonder if mother China is sending exactly the same authorization

I worry about phoning home if the company goes offline. When phoning home, sniff the packets. I wonder if mother China is sending exactly the same authorization packets back to the device every time? If so it should not be terribly difficult to spoof the DNS on your own network and set up a small server to provide the necessary answer to turn on the machine.