diff --git a/libs/openzap/src/isdn/Q931.c b/libs/openzap/src/isdn/Q931.c
index 9bf16f2c78..3d76b23051 100644
--- a/libs/openzap/src/isdn/Q931.c
+++ b/libs/openzap/src/isdn/Q931.c
@@ -351,7 +351,7 @@ L3INT Q931Rx23(Q931_TrunkInfo *pTrunk, L3UCHAR * buf, L3INT Size)
 L3INT Q931Tx34(Q931_TrunkInfo *pTrunk, L3UCHAR * Mes, L3INT Size)
 {
 	if (pTrunk->Q931Tx34CBProc) {
-		return pTrunk->Q931Tx34CBProc(pTrunk->PrivateData, Mes, Size);
+		return pTrunk->Q931Tx34CBProc(pTrunk->PrivateData34, Mes, Size);
 	}
 	return Q931E_MISSING_CB;    
 }
@@ -409,7 +409,7 @@ L3INT Q931Tx32(Q931_TrunkInfo *pTrunk, L3UCHAR * Mes, L3INT Size)
 	if(RetCode >= Q931E_NO_ERROR)
 	{
 		if (pTrunk->Q931Tx32CBProc) {
-			RetCode = pTrunk->Q931Tx32CBProc(pTrunk->PrivateData, pTrunk->L2Buf, Size);
+			RetCode = pTrunk->Q931Tx32CBProc(pTrunk->PrivateData32, pTrunk->L2Buf, Size);
 		} else {
 			RetCode = Q931E_MISSING_CB;
 		}
@@ -434,9 +434,9 @@ L3INT Q931Tx32(Q931_TrunkInfo *pTrunk, L3UCHAR * Mes, L3INT Size)
 void Q931SetError(Q931_TrunkInfo *pTrunk,L3INT ErrID, L3INT ErrPar1, L3INT ErrPar2)
 {
 	if (pTrunk->Q931ErrorCBProc) {
-		pTrunk->Q931ErrorCBProc(pTrunk->PrivateData, ErrID, ErrPar1, ErrPar2);
+		pTrunk->Q931ErrorCBProc(pTrunk->PrivateData34, ErrID, ErrPar1, ErrPar2);
 	} else {
-		Q931ErrorProc(pTrunk->PrivateData, ErrID, ErrPar1, ErrPar2);
+		Q931ErrorProc(pTrunk->PrivateData34, ErrID, ErrPar1, ErrPar2);
 	}
 }
 
diff --git a/libs/openzap/src/isdn/Q931api.c b/libs/openzap/src/isdn/Q931api.c
index 8de8c717b6..95ce6620a4 100644
--- a/libs/openzap/src/isdn/Q931api.c
+++ b/libs/openzap/src/isdn/Q931api.c
@@ -75,7 +75,8 @@ L3INT Q931Api_InitTrunk(Q931_TrunkInfo *pTrunk,
 						Q931TxCB_t Q931Tx34CBProc,
 						Q931TxCB_t Q931Tx32CBProc,
 						Q931ErrorCB_t Q931ErrorCBProc,
-						void *PrivateData)
+						void *PrivateData32,
+						void *PrivateData34)
 {
 	int y, dchannel, maxchans, has_sync = 0;
 
@@ -105,7 +106,8 @@ L3INT Q931Api_InitTrunk(Q931_TrunkInfo *pTrunk,
 	pTrunk->Q931Tx34CBProc = Q931Tx34CBProc;
 	pTrunk->Q931Tx32CBProc = Q931Tx32CBProc;
 	pTrunk->Q931ErrorCBProc = Q931ErrorCBProc;
-	pTrunk->PrivateData = PrivateData;
+	pTrunk->PrivateData32 = PrivateData32;
+	pTrunk->PrivateData34 = PrivateData34;
 
     pTrunk->LastCRV		= 0;
     pTrunk->Dialect		= Dialect;       
diff --git a/libs/openzap/src/isdn/include/Q931.h b/libs/openzap/src/isdn/include/Q931.h
index b546858e07..00c54a4ad5 100644
--- a/libs/openzap/src/isdn/include/Q931.h
+++ b/libs/openzap/src/isdn/include/Q931.h
@@ -1968,7 +1968,8 @@ struct Q931_TrunkInfo
 	Q931TxCB_t	Q931Tx34CBProc;
 	Q931TxCB_t	Q931Tx32CBProc;
 	Q931ErrorCB_t Q931ErrorCBProc;
-	void *PrivateData;
+	void *PrivateData32;
+	void *PrivateData34;
 
 	L3UCHAR     Enabled;            /* Enabled/Disabled                     */
                                     /*  0 = Disabled                        */
@@ -2440,6 +2441,7 @@ L3INT Q931Api_InitTrunk(Q931_TrunkInfo *pTrunk,
 						Q931TxCB_t Q931Tx34CBProc,
 						Q931TxCB_t Q931Tx32CBProc,
 						Q931ErrorCB_t Q931ErrorCBProc,
-						void *PrivateData);
+						void *PrivateData32,
+						void *PrivateData34);
 
 #endif /* _Q931_NL */