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ITU-T E.165.1 Use of escape code '0' within the E.164 numbering plan during the transition period to implementation of NPI mechanism
ITU-T X.123 Mapping between escape codes and TOA/NPI for E.164/X.121 numbering plan interworking during the transition period
ITU-T X.115 AMD 1 Definition of address translation capability in public data networks; Amendment 1: Refinements
ITU-T X.116 Address translation registration and resolution protocol
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 X.637 Basic connection-oriented common upper layer requirements
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 T.174 Application Programming Interface (API) for MHEG-1
ITU-T T.85 AMD 1 T.85 (1995) Amendment 1
ITU-T F.19 Collection and dissemination of official service information