diff --git a/src/Network/fgcom.cxx b/src/Network/fgcom.cxx
index a7c397d..57818a0 100644
--- a/src/Network/fgcom.cxx
+++ b/src/Network/fgcom.cxx
@@ -41,7 +41,7 @@
 #include <iaxclient.h>
 
 
-#define NUM_CALLS 4
+#define NUM_CALLS 1
 #define MAX_GND_RANGE 10.0
 #define MAX_TWR_RANGE 50.0
 #define MAX_RANGE 100.0
@@ -244,7 +244,7 @@ void FGCom::postinit()
     }
     
     //WARNING: this _must_ be executed after sound system is totally initialized !
-    if( iaxc_initialize(4) ) {
+    if( iaxc_initialize(NUM_CALLS) ) {
         SG_LOG(SG_SOUND, SG_ALERT, "FGCom: cannot initialize iaxclient");
         _enabled = false;
         return;