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ITU-T X.440 Message handling systems: Voice messaging system
ITU-T X.78 Interworking procedures between networks providing frame relay data transmission services via B-ISDN
ITU-T X.931 Information technology - Open Distributed Processing - Protocol support for computational interactions
ITU-T X.960 Information technology - Open Distributed Processing - Type repository function
ITU-T X.281 Information technology - Elements of management information related to the OSI Physical Layer
ITU-T F.400/X.400 (06/99) Message handling system and service overview
ITU-T X.282 Elements of management information related to the OSI Data Link layer
ITU-T X.235 AMD 1 Efficiency enhancements
ITU-T X.236 AMD 1 Efficency enhancements
ITU-T X.488 Message handling systems - EDI-MS attributes PICS proforma
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