internal void PauseCall(CallViewModel viewModel)
 {
     lock (CallsViewModelList)
     {
         if (FindCallViewModel(viewModel))
         {
             LOG.Info(String.Format("Pausing call for {0}. {1}", viewModel.CallerInfo,
                                    viewModel.ActiveCall.NativeCallPtr));
             viewModel.PauseCall();
         }
     }
 }
 internal void PauseCall(CallViewModel viewModel)
 {
     lock (CallsViewModelList)
     {
         if (FindCallViewModel(viewModel))
         {
             LOG.Info(String.Format("Pausing call for {0}. {1}", viewModel.CallerInfo,
                 viewModel.ActiveCall.NativeCallPtr));
             viewModel.PauseCall();
         }
     }
 }