The invention relates to a method for selecting transmission entities for supporting
services within and between networks. The problem of selecting a transmission entity,
taking as well a plurality of service parameter as a plurality of transmission
entities into account, is solved by sending a request including a set of parameter
to a number of transmission entities. The receiver of said request check, whether
they support the requested service, or if they can offer an alternative. They transmission
to different transmission entities is performed offering a number of alternatives.