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ETSI ETS 300 359-4
M00000490
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ETSI ETS 300 359-4 Integrated Services Digital Network (ISDN); Completion of Calls to Busy Subscriber (CCBS) 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 specific
standard by European Telecommunications Standards Institute, 09/01/1997
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