diff --git a/src/Network/fgcom.cxx b/src/Network/fgcom.cxx
index c6b5fa8..58dff51 100644
--- a/src/Network/fgcom.cxx
+++ b/src/Network/fgcom.cxx
@@ -645,6 +645,9 @@ void FGCom::valueChanged(SGPropertyNode *prop)
           _mpTransmitFrequencyNode->setValue(_currentCallFrequency * 1000000);
           _mpTransmitPowerNode->setValue(1.0);
 
+          fgSetString("/sim/screen/white","PTT按下，请讲...");
+
+
           SGPath soundpath( globals->get_fg_root() );
           soundpath.append("/Sounds/ptt.wav");
 
@@ -664,11 +667,7 @@ void FGCom::valueChanged(SGPropertyNode *prop)
       }
       else {
 //          iaxc_output_level_set(getCurrentCommVolume());
-          iaxc_output_level_set(1.0);
-          iaxc_input_level_set(0.0);
-//          SG_LOG(SG_SOUND, SG_ALERT, "FGCom: PTT release: " << _currentCallFrequency << " vol=" << getCurrentCommVolume());
-          _mpTransmitFrequencyNode->setValue(0);
-          _mpTransmitPowerNode->setValue(0);
+
 
           SGPath soundpath( globals->get_fg_root() );
           soundpath.append("/Sounds/click.wav");
@@ -681,6 +680,15 @@ void FGCom::valueChanged(SGPropertyNode *prop)
 
           SG_LOG(SG_SOUND, SG_INFO, "CMD :" << urlcmd );
           system(urlcmd.c_str());
+
+          iaxc_output_level_set(1.0);
+          iaxc_input_level_set(0.0);
+//          SG_LOG(SG_SOUND, SG_ALERT, "FGCom: PTT release: " << _currentCallFrequency << " vol=" << getCurrentCommVolume());
+          _mpTransmitFrequencyNode->setValue(0);
+          _mpTransmitPowerNode->setValue(0);
+
+          fgSetString("/sim/screen/white","PTT释放");
+
       }
   }