This paper provides a proof of concept of an SDN Application to provide QoS for real-time services on SDN networks. Common real-time services are for example VoIP or M2M protocols like OPC UA and MQTT. We provide a proof of concept in the form of a specialized application for SIP traffic. The application lowers the latency and call-setup-time for VoIP calls. The application uses the metering and queueing features of OpenFlow 1.3 to assure high quality of service. The evaluation and optimization of the application is still in progress.