In this paper, we demonstrate an implementation of a Network Services Abstraction Layer (NSAL) on top of the network control and management plane. Furthermore, we introduce a unified data model for both Software Defined Networking (SDN) and legacy devices that allows managing and configuring both networks in a unified way in order to achieve Quality of Service (QoS) for time-critical tasks (e.g. VoIP). Due to the unified data model, network operators are able to manage their network through one interface. We demonstrate a use case by implementing a VoIP scheduling application on top of the NSAL and evaluate VoIP call quality in a distributed heterogeneous network.
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