Merge branch 'WJC' into wxr7

wxr

2021-09-01 ff340e5a0ede97e03e9485ef6e608f743d9934f7

 HDL_ON/DAL/ThirdPartySdk/HDLLinphone.cs

@@ -553,6 +553,7 @@
                                    {
                                        GoToHDLLinphoneIntercomActivity();
                                    });

                                }
                            }
                          
@@ -592,7 +593,7 @@
        /// <returns></returns>
        public bool CheckIncomingCallThreadIsNull()
        {
            return checkIncomingCallThread == null;
            return checkIncomingCallThread == null || checkIncomingCallThread.ThreadState != ThreadState.Running;
        }

        #endregion