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ETSI EN 300 138-1

Integrated Services Digital Network (ISDN); Closed User Group (CUG) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol; Part 1: Protocol specification
standard by European Telecommunications Standards Institute, 06/01/1998
Publisher: ETSI

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Update references from ETS 300 102-1 and associated I-ETSs to ETS 300 403.

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