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ETSI ETS 300 138-3
M00001011
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ETSI ETS 300 138-3 Integrated Services Digital Network (ISDN); Closed User Group (CUG) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol; Part 3: Test Suite Structure and Test Purposes (TSS&TP) specification for the user
standard by European Telecommunications Standards Institute, 09/01/1996
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