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ETSI EN 300 356-8
M00000012
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ETSI EN 300 356-8 Integrated Services Digital Network (ISDN); Signalling System No.7; ISDN User Part (ISUP) version 3 for the international interface; Part 8: User-to-User Signalling (UUS) supplementary service [ITU-T Recommendation Q.737, clause 1 (1997), modified]
standard by European Telecommunications Standards Institute, 08/01/1998
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