There is provided a network information system for determining transport conditions in a communications network. Monitoring data is acquired from a plurality of data transport nodes in a communications network. Transport conditions are determined from network information related to transport flows for network transmission of real time media flows. The network information is determined from a subset of the acquired monitoring data. The determined transport conditions are provided to at least one of a network connected device running an application involving the network transmission of real time media flows and a data transport node involved in the network transmission of real time media flows.