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ETSI ETS 300 369-4
M00000660
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ETSI ETS 300 369-4 Integrated Services Digital Network (ISDN); Explicit Call Transfer (ECT) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol; Part 4: Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) proforma specification for the use
standard by European Telecommunications Standards Institute, 05/01/1997
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