diff --git a/apps/openmw-mp/GUI.cpp b/apps/openmw-mp/GUI.cpp
index 08b6be7a3..647a42b31 100644
--- a/apps/openmw-mp/GUI.cpp
+++ b/apps/openmw-mp/GUI.cpp
@@ -35,8 +35,33 @@ void GUI::processUpdate()
     packet->Send(false);
 }
 
-void GUI::messageBox(int id, const char *label)
+int GUI::generateGuiId()
 {
+    int id = 0;
+
+    for (const auto &item: callbacks)
+    {
+        if (item.second == nullptr)
+        {
+            id = item.first;
+            break;
+        }
+    }
+
+    if (id == 0)
+        id = lastGuiId++;
+
+    return id;
+}
+
+void GUI::messageBox(sol::function fn, const char *label, sol::this_environment te)
+{
+    if(!fn.valid())
+        return;
+
+    int id = generateGuiId();
+    callbacks[id] = std::make_shared<sol::function>(fn);
+
     player->guiMessageBox.id = id;
     player->guiMessageBox.label = label;
     player->guiMessageBox.type = Player::GUIMessageBox::Type::MessageBox;
@@ -44,8 +69,14 @@ void GUI::messageBox(int id, const char *label)
     setChanged();
 }
 
-void GUI::customMessageBox(int id, const char *label, const char *buttons)
+void GUI::customMessageBox(sol::function fn, const char *label, const char *buttons, sol::this_environment te)
 {
+    if(!fn.valid())
+        return;
+
+    int id = generateGuiId();
+    callbacks[id] = std::make_shared<sol::function>(fn);
+
     player->guiMessageBox.id = id;
     player->guiMessageBox.label = label;
     player->guiMessageBox.buttons = buttons;
@@ -54,8 +85,14 @@ void GUI::customMessageBox(int id, const char *label, const char *buttons)
     setChanged();
 }
 
-void GUI::inputDialog(int id, const char *label)
+void GUI::inputDialog(sol::function fn, const char *label, sol::this_environment te)
 {
+    if(!fn.valid())
+        return;
+
+    int id = generateGuiId();
+    callbacks[id] = std::make_shared<sol::function>(fn);
+
     player->guiMessageBox.id = id;
     player->guiMessageBox.label = label;
     player->guiMessageBox.type = Player::GUIMessageBox::Type::InputDialog;
@@ -63,8 +100,14 @@ void GUI::inputDialog(int id, const char *label)
     setChanged();
 }
 
-void GUI::passwordDialog(int id, const char *label, const char *note)
+void GUI::passwordDialog(sol::function fn, const char *label, const char *note, sol::this_environment te)
 {
+    if(!fn.valid())
+        return;
+
+    int id = generateGuiId();
+    callbacks[id] = std::make_shared<sol::function>(fn);
+
     player->guiMessageBox.id = id;
     player->guiMessageBox.label = label;
     player->guiMessageBox.note = note;
@@ -73,8 +116,14 @@ void GUI::passwordDialog(int id, const char *label, const char *note)
     setChanged();
 }
 
-void GUI::listBox(int id, const char *label, const char *items)
+void GUI::listBox(sol::function fn, const char *label, const char *items, sol::this_environment te)
 {
+    if(!fn.valid())
+        return;
+
+    int id = generateGuiId();
+    callbacks[id] = std::make_shared<sol::function>(fn);
+
     player->guiMessageBox.id = id;
     player->guiMessageBox.label = label;
     player->guiMessageBox.data = items;
@@ -83,6 +132,16 @@ void GUI::listBox(int id, const char *label, const char *items)
     setChanged();
 }
 
+void GUI::onGUIAction()
+{
+    auto it = callbacks.find(player->guiMessageBox.id);
+    if (it != callbacks.end() && it->second != nullptr)
+    {
+        it->second->call(player, player->guiMessageBox.data);
+        it->second = nullptr;
+    }
+}
+
 void GUI::setMapVisibility(unsigned short targetPID, unsigned short affectedPID, unsigned short state)
 {
     LOG_MESSAGE(Log::LOG_WARN, "stub");
diff --git a/apps/openmw-mp/GUI.hpp b/apps/openmw-mp/GUI.hpp
index 36eb61709..7f48f6bc0 100644
--- a/apps/openmw-mp/GUI.hpp
+++ b/apps/openmw-mp/GUI.hpp
@@ -17,13 +17,15 @@ public:
 public:
     explicit GUI(Player *player);
 
-    void messageBox(int id, const char *label);
+    void messageBox(sol::function fn, const char *label, sol::this_environment te);
 
-    void customMessageBox(int id, const char *label, const char *buttons);
-    void inputDialog(int id, const char *label);
-    void passwordDialog(int id, const char *label, const char *note);
+    void customMessageBox(sol::function fn, const char *label, const char *buttons, sol::this_environment te);
+    void inputDialog(sol::function fn, const char *label, sol::this_environment te);
+    void passwordDialog(sol::function fn, const char *label, const char *note, sol::this_environment te);
 
-    void listBox(int id, const char *label, const char *items);
+    void listBox(sol::function fn, const char *label, const char *items, sol::this_environment te);
+
+    void onGUIAction();
 
     //state 0 - disallow, 1 - allow
     void setMapVisibility(unsigned short targetPID, unsigned short affectedPID, unsigned short state);
@@ -38,9 +40,12 @@ public:
     unsigned int getChanges() const;
 
 private:
+    int generateGuiId();
     void processUpdate() final;
     std::unordered_map<int, std::shared_ptr<Window>> windows;
+    std::unordered_map<int, std::shared_ptr<sol::function>> callbacks;
     int lastWindowId;
+    int lastGuiId; // for message boxes
 };
 
 class QuickKey
diff --git a/apps/openmw-mp/processors/player/ProcessorGUIMessageBox.hpp b/apps/openmw-mp/processors/player/ProcessorGUIMessageBox.hpp
index de7e6bc1e..0f8c3ac19 100644
--- a/apps/openmw-mp/processors/player/ProcessorGUIMessageBox.hpp
+++ b/apps/openmw-mp/processors/player/ProcessorGUIMessageBox.hpp
@@ -21,8 +21,7 @@ namespace mwmp
         {
             DEBUG_PRINTF(strPacketID.c_str());
 
-            Networking::get().getState().getEventCtrl().Call<CoreEvent::ON_GUI_ACTION>(player.get(), player->guiMessageBox.id,
-                                                                                       player->guiMessageBox.data);
+            player->getGUI().onGUIAction();
         }
     };
 }