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ETSI ETS 300 185-1/A1
M00000337
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ETSI ETS 300 185-1/A1 Amendment 1 to - Integrated Services Digital Network (ISDN); Conference call, add-on (CONF) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol; Part 1: Protocol specification
Amendment by European Telecommunications Standards Institute, 06/01/1995
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