Some problem with Grandstream IP phones

Hi all, I have a problem with provisioning on grandstream phones (Tried GXP1628 and 2140-2160).

I use Yeastar S20 as pbx but when I apply config and it asks me to reboot... phone isnt' rebooting at all. Also, is there a way to use Grandstream's P-Codes? I usually use em within Grandstream PBX to set some various preferences that zeroconfig doesn't cover (Like codec preference or keep alive) but cannot see a way to use em on Yeastar hardware.

This two problems are really keeping me from migrating to Yeastar PBX because I usually have 50+ extension to setup everytime and it's not something I would do 1by1

Any answer will be greatly appreciated


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