This paper presents the experimental validation of a vertical application on multimedia real-time communications use case in which its services are managed by a network slice manager. The network slice manager has been developed in the 5GTANGO project for the SONATA NFV Service Platform. It used to partition the 5G network and dynamically deploy network slices with quality of service (QoS). Network slices exist in parallel and isolated for the different tenants (e.g., vertical industries) in

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... er to deliver the tenant- specific requirements (e.g., latency, bandwidth).The network slice manager has been experimentally validated in the multimedia real-time communications pilot deployed in the 5GTANGO project, considering the development and instantiation of two network slices with different QoS.