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diff --git a/TAO/tao/Invocation_Utils.h b/TAO/tao/Invocation_Utils.h
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+++ b/TAO/tao/Invocation_Utils.h
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+// -*- C++ -*-
+
+//=============================================================================
+/**
+ *  @file    Invocation_Utils.h
+ *
+ *  $Id$
+ *
+ *
+ *  @author Balachandran Natarajan <bala@dre.vanderbilt.edu>
+ */
+//=============================================================================
+
+#ifndef TAO_INVOCATION_UTILS_H
+#define TAO_INVOCATION_UTILS_H
+#include /**/ "ace/pre.h"
+
+#include "ace/config-all.h"
+
+#if !defined (ACE_LACKS_PRAGMA_ONCE)
+# pragma once
+#endif /* ACE_LACKS_PRAGMA_ONCE */
+
+#include /**/ "tao/Versioned_Namespace.h"
+
+TAO_BEGIN_VERSIONED_NAMESPACE_DECL
+
+namespace TAO
+{
+  enum Invocation_Status
+    {
+      /// Initial state of the FSM in the invocation class.
+      TAO_INVOKE_START = 0,
+      /// The request must be restarted, a temporary failure has
+      /// occured.
+      TAO_INVOKE_RESTART,
+      /// invoke() call successful. Final state of the FSM.
+      TAO_INVOKE_SUCCESS,
+      /// Received a user exception from the remote object, and this
+      /// is one of the final states.
+      TAO_INVOKE_USER_EXCEPTION,
+      /// Received a system exception from the remote object or the
+      /// PI and it is one of the final states
+      TAO_INVOKE_SYSTEM_EXCEPTION,
+      /// Invocation failed. It is a final state.
+      TAO_INVOKE_FAILURE
+    };
+
+  /// Enums for invocation types
+  enum Invocation_Type {
+    /// A simple oneway invocation
+    TAO_ONEWAY_INVOCATION,
+    /// A simple twoway invocation
+    TAO_TWOWAY_INVOCATION
+  };
+
+  /// Enum for invocation modes
+  enum Invocation_Mode {
+    /// Standard synchronous twoway
+    TAO_SYNCHRONOUS_INVOCATION,
+    /// Asynchronous twoway with callback model for collecting the
+    /// replies.
+    TAO_ASYNCHRONOUS_CALLBACK_INVOCATION,
+    /// Asynchronous twoway with poller model for collecting the
+    /// replies.
+    /// @note This is not supported in TAO now
+    TAO_ASYNCHRONOUS_POLLER_INVOCATION,
+    /// Types of DII
+    TAO_DII_INVOCATION,
+    TAO_DII_DEFERRED_INVOCATION,
+    TAO_DII_ASYNCH_INVOCATION
+  };
+}
+
+TAO_END_VERSIONED_NAMESPACE_DECL
+
+#include /**/ "ace/post.h"
+#endif /* TAO_INVOCATION_UTILS_H */