+/**
+ * @brief Connects the voice control service synchronously.
+ * @since_tizen 4.0
+ * @privlevel public
+ * @privilege %http://tizen.org/privilege/recorder
+ * @return @c 0 on success,
+ * otherwise a negative error value
+ * @retval #VC_ERROR_NONE Successful
+ * @retval #VC_ERROR_INVALID_STATE Invalid state
+ * @retval #VC_ERROR_OPERATION_FAILED Operation failure
+ * @retval #VC_ERROR_PERMISSION_DENIED Permission denied
+ * @retval #VC_ERROR_NOT_SUPPORTED Not supported
+ * @pre The state should be #VC_STATE_INITIALIZED.
+ * @post If this function is called, the state will be #VC_STATE_READY.
+ * @see vc_unprepare()
+ */