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ITU-T X.160 Architecture for customer network management service for public data networks
ITU-T X.321 General arrangements for interworking between Circuit-Switched Public Data Networks (CSPDNs) and Integrated Service Digital Networks (ISDNs) for the provision of data transmission services
ITU-T X.301 Description of the general arrangements for call control within a subnetwork and between subnetworks for the provision of data transmission services
ITU-T X.325 General arrangements for interworking between Packet-Switched Public Data Networks (PSPDNs) and Integrated Services Digital Networks (ISDNs) for the provision of data transmission services
ITU-T X.300 General principles for interworking between public networks and between public networks and other networks for the provision of data transmission services
ITU-T F.72 The international telex service - General principles and operational aspects of a store and forward facility
ITU-T F.127 Operational procedures for interworking between the international telex service and the service offered by the INMARSAT-C system
ITU-T U.81 International telex store-and-forward - Delivery to a telex subscriber
ITU-T U.208 The international telex service - Interworking with the INMARSAT C system using one-stage selection
ITU-T E.771 Network grade of service parameters and target values for circuit-switched public land mobile services