The OEM (Original Equipment Manufacturer) initialization method lets you pre-program the computers at the factory (on agreement with the OEM) and does not require you to touch the computers at the site.
When an OEM delivers computers with the Intel AMT device already initialized, the PID-PPS key pairs are already entered into the Intel AMT device firmware. All that remains is to import the file that contains PID-PPS pairs that are supplied by the OEM (in the form of a setup.bin file) into the Intel SCS database.
After you plugged in an Intel AMT computer for the first time, it sends Hello messages to OOB site server computer (by default, the Notification Server computer) only for the first 24 hours. If the computer was not set up and configured during that time (due to Intel SCS unavailable, or network problems), you must make the Intel AMT device to resend Hello messages.