--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/vtengines/videoteleng/Inc/Session/MVtEngDtmfHandler.h	Mon Nov 23 14:47:47 2009 +0200
@@ -0,0 +1,110 @@
+/*
+* Copyright (c) 2004 Nokia Corporation and/or its subsidiary(-ies).
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description:  DTMF handler interface for DTMF states and media 
+*                handler to use.
+*
+*/
+
+
+
+#ifndef MVTENGDTMFHANDLER_H
+#define MVTENGDTMFHANDLER_H
+
+//  INCLUDES
+#include <e32std.h>
+
+// DATA TYPES
+
+// FORWARD DECLARATIONS
+class CVtEngOperation;
+class TVtEngDtmfTone;
+class MVTUserInput;
+class CVtEngDtmfState;
+
+// CLASS DECLARATION
+
+/**
+*  Base class for data types
+*
+*  @lib videoteleng
+*  @since 2.6
+*/
+class MVtEngDtmfHandler
+    {
+    public: // 
+        /**
+        * Dtmf states
+        */
+        enum TVtEngDtmfState 
+            {
+            // Not sending DTMF
+            EVtDtmfStateIdle = 0,
+            // Sending DTMF
+            EVtDtmfStateSending,
+            // Sending DTMF, another waiting in buffer
+            EVtDtmfStateBuffered
+            };
+
+    public:
+
+        /**
+        * Handles a DTMF command.
+        * @param 
+        */
+        virtual void HandleL( CVtEngOperation& aOp ) = 0;
+
+        /**
+        * Activates a DTMF state.
+        * @param aNewState state index
+        * @return activated state
+        */
+        virtual CVtEngDtmfState& ActivateState( 
+            MVtEngDtmfHandler::TVtEngDtmfState aNewState ) = 0;
+
+        /**
+        * Handles completion of DTMF sending, non-leavable method.
+        * @param aError Symbian OS error code
+        */
+        virtual void SendComplete( TInt aError ) = 0;
+
+        /**
+        * Returns new instance used for sending DTMF tone to protocol 
+        * @param aTone tone to send
+        * @return protocol DTMF tone.
+        */
+        virtual MVTUserInput& ReserveProtoDtmfL(
+            const TVtEngDtmfTone& aTone  ) = 0;
+
+        /**
+        * Releses protocol DTMF instance.
+        */
+        virtual void ReleaseProtoDtmf() = 0;
+
+		/**
+        * Compares last issued DTMF command ID to given command ID.
+        * @param aCheckCommandId command ID to be compared against
+        * @return ETrue if IDs are same, otherwise EFalse
+        */
+		virtual TBool CheckCommandId( TInt aCheckCommandId ) const = 0 ;
+
+		/**
+        * Stores command ID, used in CheckCommandID.
+        * @param aStoreCommandId command ID to be stored.        
+        */
+		virtual void StoreCommandId( TInt aStoreCommandId ) = 0;
+    };
+
+#endif      MVTENGDTMFHANDLER_H
+
+// End of File