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M00000100
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ETSI EN 300 196-4
Integrated Services Digital Network (ISDN); Generic functional protocol for the support of supplementary services; Digital Subscriber Signalling System No. one (DSS1) protocol; Part 4: Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) proforma specifstandard by European Telecommunications Standards Institute, 11/01/2001
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