The development of the Single Window concept (unique access/contact point for composite services) for the multimodal door-to-door freight transport management is a complex endeavour that is being addressed by the European MIELE project. Led by port authorities, the project identified the need for a novel strategy to foster collaboration among stakeholders with a diversity of processes and technology. The multimodal perspective requires a convergence and thus collaboration of maritime, railway, road, and air transport facilities as it is the case for the need of traffic information for a real-time (re)planning if some accident is hindering the current route. This requires that traffic information from different operators is integrated into the freight transport routing planner. Furthermore, a unified coordination and operations management of the existing business processes is lacking. To integrate such contexts, an open enterprise collaboration network (ECoNet) infrastructure is presented and discussed.