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ETSI EN 300 899-1
M00001676
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ETSI EN 300 899-1 Integrated Services Digital Network (ISDN); Signalling System No.7; Interworking between ISDN User Part (ISUP) version 2 and Digital Subscriber Signalling System No. one (DSS1); Part 1: Protocol specification [ITU-T Recommendation Q.699, modified]
standard by European Telecommunications Standards Institute, 09/01/1998
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