A method and intermediate node for service specific configuration of Quality of Service (QoS), preferably end-to-end QoS, in a data network by establishing and enforcing a service specific QoS configuration for a given service supported by a client device. The client device is adapted to be connected to a data network including a service management server and the intermediate node. The intermediate node receives from the service management server, a message including a service configuration for the given service. The service configuration includes information regarding the service specific QoS configuration.