| Platform SDK: TAPI | 
Gets the callback instance associated with this event.
HRESULT get_CallbackInstance( long *plCallbackInstance );
| Value | Meaning | 
|---|---|
| S_OK | Method succeeded. | 
| E_OUTOFMEMORY | Insufficient memory exists to perform the operation. | 
| E_POINTER | The plCallbackInstance parameter is not a valid pointer. | 
  Windows NT/2000: Requires Windows 2000.
  Version: Requires TAPI 3.0 or later.
  Header: Declared in Tapi3.h.
  Library: Use T3iid.lib.
ITCallInfoChangeEvent, ITTAPI::RegisterCallNotifications, Call Object