diff --git a/src/Network/fgcom.cxx b/src/Network/fgcom.cxx
index 7cd435b..4eb9da7 100644
--- a/src/Network/fgcom.cxx
+++ b/src/Network/fgcom.cxx
@@ -246,14 +246,15 @@ void FGCom::postinit()
     app += _version_node->getStringValue();
 
     iaxc_set_callerid( _callsign_node->getStringValue().c_str(), app.c_str() );
-    //iaxc_set_formats (IAXC_FORMAT_SPEEX, IAXC_FORMAT_ULAW|IAXC_FORMAT_SPEEX);
 
-    iaxc_set_formats (IAXC_FORMAT_GSM, IAXC_FORMAT_ULAW|IAXC_FORMAT_GSM);
+    iaxc_set_formats (IAXC_FORMAT_SPEEX, IAXC_FORMAT_ULAW|IAXC_FORMAT_SPEEX);
+
+    //iaxc_set_formats (IAXC_FORMAT_GSM, IAXC_FORMAT_ULAW|IAXC_FORMAT_GSM);
 
 
 
 
-    //iaxc_set_speex_settings(1, 5, 0, 1, 0, 3);
+    iaxc_set_speex_settings(1, 5, 0, 1, 0, 3);
 
     //iaxc_set_filters(IAXC_FILTER_AGC | IAXC_FILTER_DENOISE);
     //iaxc_set_silence_threshold(_silenceThd_node->getFloatValue());
@@ -291,6 +292,7 @@ void FGCom::postinit()
     //FIXME: OpenAL driver use an hard-coded device
     //       so all following is unused finally until someone
     //       implement "multi-device" support in IAX audio driver
+
     SGPropertyNode *node     = fgGetNode("/sim/fgcom", 0, true);
 
     struct iaxc_audio_device *devs;
@@ -338,8 +340,15 @@ void FGCom::postinit()
 
     iaxc_millisleep(50);
 
+    //zhongjin
+    iaxc_millisleep(500);
+
+
     // Do the first call at start
     setupCommFrequency();
+
+    iaxc_millisleep(500);
+
     connectToCommFrequency();
 }