+XBT_PUBLIC_DATA( surf_callback(void, simgrid::surf::NetworkAction*, e_surf_action_state_t, e_surf_action_state_t)) networkActionStateChangedCallbacks;
+
+/** @ingroup SURF_callbacks
+ * @brief Callbacks handler which emits the callbacks after communication created
+ * @details Callback functions have the following signature: `void(NetworkAction *action, RoutingEdge *src, RoutingEdge *dst, double size, double rate)`
+ */
+XBT_PUBLIC_DATA( surf_callback(void, simgrid::surf::NetworkAction*, simgrid::surf::RoutingEdge *src, simgrid::surf::RoutingEdge *dst, double size, double rate)) networkCommunicateCallbacks;
+
+}
+}