diff --git a/src/Network/fgcom.cxx b/src/Network/fgcom.cxx
index a43d635..5cd4904 100644
--- a/src/Network/fgcom.cxx
+++ b/src/Network/fgcom.cxx
@@ -675,7 +675,7 @@ void FGCom::valueChanged(SGPropertyNode *prop)
           urlcmd.append(soundpath.c_str());
 
           SG_LOG(SG_SOUND, SG_INFO, "CMD :" << urlcmd );
-          system(urlcmd.c_str());
+          popen(urlcmd.c_str(),"r");
 
           iaxc_output_level_set(1.0);
           iaxc_input_level_set(0.0);
@@ -683,7 +683,8 @@ void FGCom::valueChanged(SGPropertyNode *prop)
           _mpTransmitFrequencyNode->setValue(0);
           _mpTransmitPowerNode->setValue(0);
 
-          fgSetString("/sim/screen/white","PTT释放");
+//          fgSetString("/sim/screen/white","PTT释放");
+          mesPopup("PTT释放",3);
 
       }
   }