Control and accounting of user access to a PDN from private X.25 data networks

Methods have been developed in a DFN (Deutsches Forschungs-Netz) project for checking access rights of calls into the DATEX-P public network and recording costs which can be assigned to users. This is done using a gateway computer. The methods which can be used for interactive services using X.3, X.28 and X.29, and for level-7 services, are discussed. Experience with a prototype gateway computer is described.<
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