private function log_soap_call($CALL, $TIME, $QUERY, $REPLY)
    {
        array_push($this->SOAPCALLS,
                    [
                        'call'     => $CALL,
                        'time'     => $TIME,
                        'query'    => $QUERY,
                        'reply'    => $REPLY,
                    ]
            );

        return count($this->SOAPCALLS);
    }