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ETSI ETS 300 356-18
M00000410
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ETSI ETS 300 356-18 Integrated Services Digital Network (ISDN); Signalling System No.7; ISDN User Part (ISUP) version 2 for the international interface; Part 18: Completion of Calls to Busy Subscriber (CCBS) supplementary service
standard by European Telecommunications Standards Institute, 02/01/1995
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