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ETSI ETS 300 356-17
M00000411
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ETSI ETS 300 356-17 Integrated Services Digital Network (ISDN); Signalling System No.7; ISDN User Part (ISUP) version 2 for the international interface; Part 17: Call Waiting (CW) supplementary service [ITU-T Recommendation Q.733, section 1 (1992), modified]
standard by European Telecommunications Standards Institute, 02/01/1995
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