Unable to answer incoming calls on the AVM-1 (GXV3370), or AVM-2 (GXV3350)
DND (do Not disturb) on GXV3370, GXv3350, AVM-1, AVM-2 IP-AOR-CU
DND can also be enabled/disabled using the mute button (Mic icon) to right of keypad. You can disable this functionality by making the change
below:- Web interface > Phone Settings > Call Settings > Mute Key Functions While Idle: set to Disabled.