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ETSI ETS 300 356-8
M00000435
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ETSI ETS 300 356-8 Integrated Services Digital Network (ISDN); Signalling System No.7; ISDN User Part (ISUP) version 2 for the international interface; Part 8: User-to-User Signalling (UUS) supplementary service [ITU-T Recommendation Q.737, clause 1 (1993), modified]
standard by European Telecommunications Standards Institute, 02/01/1995
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