diff --git a/libs/openzap/src/isdn/Q931.c b/libs/openzap/src/isdn/Q931.c
index 3d76b23051..ab8fb9a841 100644
--- a/libs/openzap/src/isdn/Q931.c
+++ b/libs/openzap/src/isdn/Q931.c
@@ -247,11 +247,11 @@ void Q931Initialize()
         }
     }
 
-	if(Q931CreateDialectCB[0] == NULL)
-		Q931AddDialect(0, Q931CreateTE);
+	if(Q931CreateDialectCB[Q931_Dialect_Q931 + Q931_TE] == NULL)
+		Q931AddDialect(Q931_Dialect_Q931 + Q931_TE, Q931CreateTE);
 
-	if(Q931CreateDialectCB[1] == NULL)
-		Q931AddDialect(1, Q931CreateNT);
+	if(Q931CreateDialectCB[Q931_Dialect_Q931 + Q931_NT] == NULL)
+		Q931AddDialect(Q931_Dialect_Q931 + Q931_NT, Q931CreateNT);
 
 	/* The last step we do is to call the callbacks to create the dialects  */
 	for(x=0; x< Q931MAXDLCT; x++)
diff --git a/libs/openzap/src/isdn/Q931api.c b/libs/openzap/src/isdn/Q931api.c
index 95ce6620a4..780c29fb15 100644
--- a/libs/openzap/src/isdn/Q931api.c
+++ b/libs/openzap/src/isdn/Q931api.c
@@ -110,7 +110,7 @@ L3INT Q931Api_InitTrunk(Q931_TrunkInfo *pTrunk,
 	pTrunk->PrivateData34 = PrivateData34;
 
     pTrunk->LastCRV		= 0;
-    pTrunk->Dialect		= Dialect;       
+    pTrunk->Dialect		= Dialect + NetUser;       
     pTrunk->Enabled		= 0;
     pTrunk->TrunkType	= TrunkType;
     pTrunk->NetUser		= NetUser;