Why GPP_K value?
by TheDiggler Link
The GPP_K and GPP_D values stored in your Vonage PAP2 are for use by Vonage and no one else. The adapter, by default, does not have a GPP_D value stored in it. It receives one of these values if/when the adapter “phones home” to Vonage.
Should your adapter “phone home” to Vonage, it will receive a new set of adapter settings, among which include a new GPP_K value, a populated GPP_D value, new user & admin passwords, and will re-lock your adapter & turn off its web interface! Furthermore, it will likely perform a firmware upgrade to the latest version of the PAP2 firmware (which now makes it extremely difficult to unlock the adapter w/o knowing your adapter’s admin pw).
By storing your “factory fresh” GPP_K value off to the side, you can use it to download and decrypt your Vonage XML Provisioning file(s) at will. A very slick Windows program posted @ BBR, VuckFonage, has been written to automate this process as much as possible.
Since the unlocking process instructs you to disable automatic provisioning, in theory your adapter should never “phone home” to Vonage. HOWEVER, if you perform a FACTORY RESET on the adapter while it’s connected to the internet… POOF! It will immediately “phone home,” change its settings, lock itself, and upgrade its firmware. Without your FACTORY FRESH GPP_K value saved off to the side, you won’t be able to download and decrypt your PRIMARY XML provisioning file (which will contain your admin pw at that time).
If you perform a FACTORY RESET while the PAP2 is NOT connected to the internet, the adapter will still get re-locked; however, you can repeat the standard unlocking process to re-unlock it.
Note: If you switch your adapter over to SPA-1001 firmware, there is no chance of it re-locking even if it “phones home” to Vonage. This is because the PAP2 XML config files aren’t compatible w/ SPA-1001 firmware. Also, performing a FACTORY RESET w/ the adapter in SPA-1001 mode wipes out all configured settings (including the Vonage settings) and keeps the adapter UNLOCKED.
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