// Select appropriate transport (multi-channel if available)
        try (SmbTransportImpl trans = selectTransport(request)) {
            if (response != null) {
                response.clearReceived();
                response.setExtendedSecurity(this.extendedSecurity);
            }

            try {
                if (params.contains(RequestParam.NO_TIMEOUT)) {
                    this.expiration = -1;

                }
                k = req.nextElement().getMid();
            } else {
                k = makeKey(req);
            }

            try {
                resp.clearReceived();
                long timeout = getResponseTimeout(req);
                if (!params.contains(RequestParam.NO_TIMEOUT)) {
                    resp.setExpiration(System.currentTimeMillis() + timeout);