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ETSI ETS 300 356-6
M00000405
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ETSI ETS 300 356-6 Integrated Services Digital Network (ISDN); Signalling System No.7; ISDN User Part (ISUP) version 2 for the international interface; Part 6: Connected Line Identification Restriction (COLR) supplementary service [ITU-T Recommendation Q.731, clause 6 (1993), modified]
standard by European Telecommunications Standards Institute, 02/01/1995
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