Hi Richie, I am going to disable a few codecs that the app sometimes has issues with, please test again. Regarding the not receiving calls on your grandstream, its likely because the app is still registered, it has an aggressive push server registration, you would need to reset the app to stop this. You cant use both phones simultaneously.
hi can receive calls the phone rings ones the go Thu to voice mail
Please provide me with the last 4 digits of your account number.