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ETSI ETS 300 138-1/A1
- Amendment 1 to - 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, 01/01/1996
- Publisher: ETSI
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Amendment to correct subclause 9.4.2.1, item 6, 3rd para. Correct inconsistency with stage 3n