• ETSI ETS 300 121
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ETSI ETS 300 121

  • Integrated Services Digital Network (ISDN); Application of the ISDN User Part (ISUP) of CCITT Signalling System No.7 for international ISDN interconnections (ISUP version 1)
  • standard by European Telecommunications Standards Institute, 12/01/1992
  • Publisher: ETSI

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To specify the CCITT No.7 ISUP for the international interface

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