I have a peculiar situation.
When I connect my VTech cordless 'phone to the HT802, I can make/receive calls but the call drops after 30 seconds or so. The HT802 however does not de-register
However I connected a corded 'phone and I tested a call for 8 minutes and it did not drop.
Any assistance would be appreciated.
I am looking into this matter and will revert back back to you.
It would seem like the cordless phone might be the issue as the Grandstream HT802 does not lose its registration when the call cuts. You have connected it via cable and it seemed to work perfectly fine :)