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ETSI EN 300 359-5
M00000125
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ETSI EN 300 359-5 Integrated Services Digital Network (ISDN); Completion of Calls to Busy Subscriber (CCBS) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol; Part 5: Test Suite Structure and Test Purposes (TSS&TP) specification for the network
standard by European Telecommunications Standards Institute, 06/01/1998
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