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ETSI ETS 300 359-1
M00000169
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ETSI ETS 300 359-1 Integrated Services Digital Network (ISDN); Completion of Calls to Busy Subscriber (CCBS) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol; Part 1: Protocol specification
standard by European Telecommunications Standards Institute, 11/01/1995
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