internal void DeclineCall(CallViewModel viewModel, string message)
        {
            //***********************************************************************************************************************************
            // Call Declined, Message will contain a message like I am in meeting which was selected when call is declined.
            //***********************************************************************************************************************************
            lock (CallsViewModelList)
            {
                if (FindCallViewModel(viewModel))
                {
                    LOG.Info(String.Format("Declining call for {0}. {1}", viewModel.CallerInfo,
                                           viewModel.ActiveCall.NativeCallPtr));
                    var contactID = new ContactID(
                        string.Format("{0}@{1}", viewModel.ActiveCall.RemoteParty.Username,
                                      viewModel.ActiveCall.RemoteParty.HostAddress), IntPtr.Zero);
                    var contact = ServiceManager.Instance.ContactService.FindContact(contactID);
                    if (contact == null)
                    {
                        contact = new VATRPContact(contactID)
                        {
                            Fullname         = viewModel.ActiveCall.RemoteParty.Username,
                            DisplayName      = viewModel.ActiveCall.RemoteParty.Username,
                            SipUsername      = viewModel.ActiveCall.RemoteParty.Username,
                            RegistrationName = contactID.ID
                        };
                        ServiceManager.Instance.ContactService.AddContact(contact, string.Empty);
                    }
                    viewModel.DeclineCall(false);
                    try
                    {
                        _linphoneService.DeclineCall(viewModel.ActiveCall.NativeCallPtr);
                    }
                    catch (Exception ex)
                    {
                        ServiceManager.LogError("DeclineCall", ex);
                    }

                    if (message.NotBlank())
                    {
                        if (_simpleMessageViewModel != null)
                        {
                            _simpleMessageViewModel.SetActiveChatContact(contact, IntPtr.Zero);
                            _simpleMessageViewModel.SendSimpleMessage(string.Format("{0}{1}", VATRPChatMessage.DECLINE_PREFIX, message));
                        }
                    }
                }
            }
        }
        internal void DeclineCall(CallViewModel viewModel, string message)
        {
            lock (CallsViewModelList)
            {
                if (FindCallViewModel(viewModel))
                {
                    LOG.Info(String.Format("Declining call for {0}. {1}", viewModel.CallerInfo,
                        viewModel.ActiveCall.NativeCallPtr));
                    var contactID = new ContactID(
                            string.Format("{0}@{1}", viewModel.ActiveCall.RemoteParty.Username,
                                viewModel.ActiveCall.RemoteParty.HostAddress), IntPtr.Zero);
                    var contact = ServiceManager.Instance.ContactService.FindContact(contactID);
                    if (contact == null)
                    {
                        contact = new VATRPContact(contactID)
                        {
                            Fullname = viewModel.ActiveCall.RemoteParty.Username,
                            DisplayName = viewModel.ActiveCall.RemoteParty.Username,
                            SipUsername = viewModel.ActiveCall.RemoteParty.Username,
                            RegistrationName = contactID.ID
                        };
                        ServiceManager.Instance.ContactService.AddContact(contact, string.Empty);
                    }
                    viewModel.DeclineCall(false);
                    try
                    {
                        _linphoneService.DeclineCall(viewModel.ActiveCall.NativeCallPtr);
                    }
                    catch (Exception ex)
                    {
                        ServiceManager.LogError("DeclineCall", ex);
                    }

                    if (message.NotBlank())
                    {
                        if (_simpleMessageViewModel != null)
                        {
                            _simpleMessageViewModel.SetActiveChatContact(contact, IntPtr.Zero);
                            _simpleMessageViewModel.SendMessage(string.Format("{0}{1}", VATRPChatMessage.DECLINE_PREFIX, message));
                        }
                    }
                }
            }
        }