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ETSI ETS 300 138-1/A1
M00000104
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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
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