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ITU-T X.49 Procedures for the provision of an extended multicast service for data terminal equipments (DTEs) using Recommendation X.25
ITU-T X.361 Connection of VSAT systems with Packet-Switched Public Data Networks based on X.25 procedures
ITU-T X.328 General arrangements for interworking between Public Data Networks providing frame relay data transmission services and Integrated Services Digital Networks (ISDNs) for the provision of data transmission services
ITU-T V.25 Automatic answering equipment and general procedures for automatic calling equipment on the general switched telephone network including procedures for disabling of echo control devices for both manually and automatically established calls
ITU-T F.182bis Guidelines for the support of the communication using of documents group 3 facsimile between user terminals via public networks
ITU-T E.454 Transmission performance metrics based on Error Correction Mode (ECM) facsimile