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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

$7.00$14.00

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

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