A network node or a distributed system of network nodes for facilitating real-time transport of data streams in a communication network, wherein the communication network comprises: - one or more core network functions PCF, PCRF, NSMF, CSMF, for establishing service guarantees for data flows in the communication network; - at least one selective forwarding unit, SFU, configured to, in real-time, receive a data stream from a sender via a first network link of the communication network and selectively forward the data stream to one or more receivers via respective second network links; characterized in the network node or the distributed system comprising: - a network interface configured to interface with the communication network; - a processor subsystem configured to interface between the selective forwarding unit and the one or more core network functions by: - receiving stream information from the selective forwarding unit, the stream information being indicative of a first bandwidth associated with transport of the data stream via one or more network links, the one or more network links being one or more of a group of: the first network link and the respective second network links; - based on the stream information, requesting the one or more core network functions to establish a service guarantee for the transport of the data stream via the one or more network links; and - based on the stream information, providing bitrate information to the selective forwarding unit, the bitrate information being indicative of a target bitrate to be used for the transport of the data stream via the one or more network links. - one or more core network functions PCF, PCRF, NSMF, CSMF, for establishing service guarantees for data flows in the communication network; - at least one selective forwarding unit, SFU, configured to, in real-time, receive a data stream from a sender via a first network link of the communication network and selectively forward the data stream to one or more receivers via respective second network links; - a network interface configured to interface with the communication network; - a processor subsystem configured to interface between the selective forwarding unit and the one or more core network functions by: - receiving stream information from the selective forwarding unit, the stream information being indicative of a first bandwidth associated with transport of the data stream via one or more network links, the one or more network links being one or more of a group of: the first network link and the respective second network links; - based on the stream information, requesting the one or more core network functions to establish a service guarantee for the transport of the data stream via the one or more network links; and - based on the stream information, providing bitrate information to the selective forwarding unit, the bitrate information being indicative of a target bitrate to be used for the transport of the data stream via the one or more network links. - receiving stream information from the selective forwarding unit, the stream information being indicative of a first bandwidth associated with transport of the data stream via one or more network links, the one or more network links being one or more of a group of: the first network link and the respective second network links; - based on the stream information, requesting the one or more core network functions to establish a service guarantee for the transport of the data stream via the one or more network links; and - based on the stream information, providing bitrate information to the selective forwarding unit, the bitrate information being indicative of a target bitrate to be used for the transport of the data stream via the one or more network links. <EOS>