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ETSI EN 300 210-4
M00000021
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ETSI EN 300 210-4 Integrated Services Digital Network (ISDN); Freephone (FPH) 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, 12/01/1998
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