typedef struct ICallFrameEventsVtbl
    {
        BEGIN_INTERFACE
        
        HRESULT ( STDMETHODCALLTYPE *QueryInterface )( 
            ICallFrameEvents * This,
            /* [in] */ REFIID riid,
            /* [annotation][iid_is][out] */ 
            __RPC__deref_out  void **ppvObject);
        
        ULONG ( STDMETHODCALLTYPE *AddRef )( 
            ICallFrameEvents * This);
        
        ULONG ( STDMETHODCALLTYPE *Release )( 
            ICallFrameEvents * This);
        
        HRESULT ( STDMETHODCALLTYPE *OnCall )( 
            ICallFrameEvents * This,
            /* [in] */ ICallFrame *pFrame);
        
        END_INTERFACE
    } ICallFrameEventsVtbl;