diff --git a/internal/pkg/onuadaptercore/device_handler.go b/internal/pkg/onuadaptercore/device_handler.go
index 758bf9e..64e8f24 100644
--- a/internal/pkg/onuadaptercore/device_handler.go
+++ b/internal/pkg/onuadaptercore/device_handler.go
@@ -299,7 +299,7 @@
 
 }
 
-func (dh *deviceHandler) processInterAdapterOMCIReqMessage(ctx context.Context, msg *ic.InterAdapterMessage) error {
+func (dh *deviceHandler) processInterAdapterOMCIReceiveMessage(ctx context.Context, msg *ic.InterAdapterMessage) error {
 	msgBody := msg.GetBody()
 	omciMsg := &ic.InterAdapterOmciMessage{}
 	if err := ptypes.UnmarshalAny(msgBody, omciMsg); err != nil {
@@ -546,9 +546,10 @@
 
 	switch msgType {
 	// case ic.InterAdapterMessageType_ONU_IND_REQUEST: was handled by OpenONUAC already - see comments there
-	case ic.InterAdapterMessageType_OMCI_REQUEST:
+	//OMCI_RESPONSE also accepted acc. to VOL-3756 (OMCI_REQUEST request was legacy code)
+	case ic.InterAdapterMessageType_OMCI_RESPONSE, ic.InterAdapterMessageType_OMCI_REQUEST:
 		{
-			return dh.processInterAdapterOMCIReqMessage(ctx, msg)
+			return dh.processInterAdapterOMCIReceiveMessage(ctx, msg)
 		}
 	case ic.InterAdapterMessageType_TECH_PROFILE_DOWNLOAD_REQUEST:
 		{
@@ -958,7 +959,10 @@
 func (dh *deviceHandler) doOnuSwUpgrade(ctx context.Context, apImageDsc *voltha.ImageDownload) error {
 	logger.Warnw(ctx, "onuSwUpgrade not yet implemented in deviceHandler", log.Fields{
 		"device-id": dh.deviceID, "image-name": (*apImageDsc).Name})
-	return fmt.Errorf("onuSwUpgrade not yet implemented in deviceHandler: %s", dh.deviceID)
+	//return success to comfort the core processing during integration
+	return nil
+	// TODO!!: also verify error response behavior
+	//return fmt.Errorf("onuSwUpgrade not yet implemented in deviceHandler: %s", dh.deviceID)
 }
 
 //  deviceHandler methods that implement the adapters interface requests## end #########