diff --git a/src/Network/fgcom.cxx b/src/Network/fgcom.cxx
index c079ce4..7cd435b 100644
--- a/src/Network/fgcom.cxx
+++ b/src/Network/fgcom.cxx
@@ -731,12 +731,21 @@ std::string FGCom::computePhoneNumber(const double& freq, const std::string& ica
            "%02d%02d%02d%02d%02d%06d",
            01,
            tmp[0],
-	   tmp[1],
+           tmp[1],
            tmp[2],
            tmp[3],
 	   (int) (freq * 1000 + 0.5) );
   exten[16] = '\0';
 
+  // zhongjin 测试环境，去掉机场编号
+  sprintf( exten,
+           "%02d%06d",
+           01,
+	   (int) (freq * 1000 + 0.5) );
+  exten[8] = '\0';
+
+
+
   snprintf( phoneNumber,
             sizeof (phoneNumber),
             "%s:%s@%s/%s",
@@ -744,6 +753,8 @@ std::string FGCom::computePhoneNumber(const double& freq, const std::string& ica
             _password.c_str(),
 	    _server.c_str(),
             exten);
+
+
   SG_LOG(SG_SOUND, SG_INFO, "FGCom: computePhoneNumber:" << phoneNumber << "icao:" << icao);
   return phoneNumber;
 }