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ITU-T Q.709 Signalling system no. 7 - Hypothetical signalling reference connection
ITU-T Q.941 Digital Subscriber Signalling System no. 1 (DSS 1) - ISDN user-network interface protocol profile for management
ITU-T Q.1111 Interfaces between the INMARSAT standard B system and the international public switched telephone network/ISDN
ITU-T Q.1152 Procedures for interworking between INMARSAT aeronautical mobile satellite system and the international public switched telephone network/ISDN
ITU-T S.34 Intex terminals - Requirements to effect interworking with the international telex service
ITU-T R.55 Conventional degree of distortion
ITU-T T.52 Non-latin coded character sets for telematic services
ITU-T T.82 Information technology - Coded representation of picture and audio information - Progressive bi-level image compression
ITU-T G.121 Loudness Ratings (LRs) of national systems
ITU-T G.126 Listener echo in telephone networks
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