Test Process:

BT connected to a smart phone(Android and IOS), startup PHONE, use another phone call this phone(board bt connected to), click "Reject call" or "Accepte call" button.

Test Rusult:

Phone call sucessfully reject or accept. 

But PHONE UI did not refresh as expcted. "Incoming call from ****** " always stay there, as the call is over. "Contacts" , "Recents"  and all the dial pad is dead now.  Click them gets no response. 

No log  in journactl.