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ETSI ETS 300 188-4
M00000962
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ETSI ETS 300 188-4 Integrated Services Digital Network (ISDN); Three-Party (3PTY) 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 user
standard by European Telecommunications Standards Institute, 10/01/1996
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