Index: sources/canbus/MessageDispatcher.cpp
===================================================================
diff -u -rcbb246d6efa242f927f88ac5da518dedb2d63320 -rb7c9de054c6b7a1ca4bac9fbb0ec5d4ac06620a9
--- sources/canbus/MessageDispatcher.cpp	(.../MessageDispatcher.cpp)	(revision cbb246d6efa242f927f88ac5da518dedb2d63320)
+++ sources/canbus/MessageDispatcher.cpp	(.../MessageDispatcher.cpp)	(revision b7c9de054c6b7a1ca4bac9fbb0ec5d4ac06620a9)
@@ -874,6 +874,10 @@
     bool ok = false;
     GuiActionType mActionId = vMessage.actionId;
     Sequence      mSequence = vMessage.sequence;
+
+    // UI shall acknowledge the messages is intended for UI.
+    if ( ! needsAcknow(vMessage.can_id)) return ok; // false
+
     if (mSequence < 0) {
         ok = true;
         #ifndef DISABLE_ACKNOW_CHECKIN_MESSAGE_LOG
@@ -969,3 +973,27 @@
 {
     return _needsAcknow.contains(vActionId);
 }
+
+/*!
+ * \brief   MessageDispatcher::needsAcknow
+ * \details List of the CAN channels which need Acknow
+ * \param   vCan_Id   - The message CANBus id
+ * \return  true if needs an Acknow
+ */
+bool MessageDispatcher::needsAcknow(Can_Id vCan_Id)
+{
+    bool ok = true;
+    switch(vCan_Id) { // list if the channels UI shall not Ack
+    case eChlid_HD_DG   : // 0x008, ///< HD => DG
+    case eChlid_DG_HD   : // 0x010, ///< DG => HD
+    case eDialin_HD     : // 0x400, ///< dialin => HD
+    case eHD_Dialin     : // 0x401, ///< HD => dialin
+    case eDialin_DG     : // 0x402, ///< dialin => DG
+    case eDG_Dialin     : // 0x403, ///< DG => dialin
+        ok = false;                                     break;
+
+    default:                                            break;
+    }
+
+    return ok;
+}