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ETSI ETS 300 064-1/C1
M00000666
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ETSI ETS 300 064-1/C1 Corrigendum to - Integrated Services Digital Network (ISDN); Direct Dialling In (DDI) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol; Part 1: Protocol specification
standard by European Telecommunications Standards Institute, 04/01/1994
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