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ITU-T I.741 Interworking and interconnection between ATM and switched telephone networks for the transmission of speech, voiceband data and audio signals
ITU-T F.435 Message handling services: Electronic Data Interchange messaging service
ITU-T D.150 New system for accounting in international telephony
ITU-T X.412 Information technology - Message Handling Systems (MHS): MHS routing
ITU-T X.413 Information technology - Message Handling Systems (MHS): Message store - Abstract service definition
ITU-T X.435 Information technology - Message Handling Systems (MHS): Electronic data interchange messaging system
ITU-T X.421 Message handling systems: COMFAX use of MHS
ITU-T D.117 Charging and accounting principles for the international premium rate service (IPRS)
ITU-T X.124 Arrangements for the interworking of the E.164 and X.121 numbering plans for frame relay and ATM networks
ITU-T X.170 Network-network management architecture for data networks
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