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ETSI ETS 300 356-16
M00000412
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ETSI ETS 300 356-16 Integrated Services Digital Network (ISDN); Signalling System No.7; ISDN User Part (ISUP) version 2 for the international interface; Part 16: Call Hold (HOLD) supplementary service [ITU-T Recommendation Q.733, clause 2 (1993), modified]
standard by European Telecommunications Standards Institute, 02/01/1995
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