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ETSI ETS 300 286-4
M00000298
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ETSI ETS 300 286-4 Integrated Services Digital Network (ISDN); User-to-User Signalling (UUS) 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 us
standard by European Telecommunications Standards Institute, 02/01/1998
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