diff --git a/src/Network/fgcom.cxx b/src/Network/fgcom.cxx
index 162ee92..ec17466 100644
--- a/src/Network/fgcom.cxx
+++ b/src/Network/fgcom.cxx
@@ -470,8 +470,8 @@ void FGCom::connectToCommFrequency() {
     // ensure that the current comm is still in range
 
     //zhongjin
-    SG_LOG(SG_SOUND, SG_INFO, "FGCom: connectToCommFrequency()");
-    SG_LOG(SG_SOUND, SG_INFO, "FGCom: _currentCallFrequency=" << _currentCallFrequency);
+    //SG_LOG(SG_SOUND, SG_INFO, "FGCom: connectToCommFrequency()");
+    //SG_LOG(SG_SOUND, SG_INFO, "FGCom: _currentCallFrequency=" << _currentCallFrequency);
 
 
     if ((_currentCallFrequency > 0.0) && !isInRange(_currentCallFrequency)) {
@@ -479,9 +479,11 @@ void FGCom::connectToCommFrequency() {
         _currentCallFrequency = 0.0;
     }
 
+
     // don't connected (and disconnect if already connected) when tuned freq is 0
     if (_currentCommFrequency < 1.0) {
         if (_currentCallIdent != -1) {
+
             iaxc_dump_call_number(_currentCallIdent);
             SG_LOG(SG_SOUND, SG_INFO, "FGCom: disconnect as freq 0: current call " << _currentCallIdent);
             _currentCallIdent = -1;
@@ -490,6 +492,7 @@ void FGCom::connectToCommFrequency() {
     }
 
     if (_currentCallFrequency != _currentCommFrequency || _currentCallIdent == -1) {
+
         if (_currentCallIdent != -1) {
             iaxc_dump_call_number(_currentCallIdent);
             SG_LOG(SG_SOUND, SG_INFO, "FGCom: dump_call_number " << _currentCallIdent);
@@ -501,6 +504,7 @@ void FGCom::connectToCommFrequency() {
             std::string num = computePhoneNumber(_currentCommFrequency, getAirportCode(_currentCommFrequency));
             
             _processingTimer.stamp();
+
             if (!isInRange(_currentCommFrequency)) {
                 if (_currentCallIdent != -1) {
                     SG_LOG(SG_SOUND, SG_INFO, "FGCom: disconnect call as not in range " << _currentCallIdent);
@@ -511,11 +515,14 @@ void FGCom::connectToCommFrequency() {
                 }
                 return;
             }
-            else 
-                SG_LOG(SG_SOUND, SG_WARN, "FGCom: frequency");
+
+            SG_LOG(SG_SOUND, SG_INFO, "FGCom: connectToCommFrequency num=" << num);
 
             if (!num.empty()) {
                 _currentCallIdent = iaxc_call(num.c_str());
+
+                SG_LOG(SG_SOUND, SG_INFO, "FGCom: iaxc_call(" << num << ") _currentCallIdent=" << _currentCallIdent);
+
                 if (_currentCallIdent == -1)
                     SG_LOG(SG_SOUND, SG_DEBUG, "FGCom: cannot call " << num.c_str());
                 else {