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ETSI ETS 300 267-1/A1
M00000029
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ETSI ETS 300 267-1/A1 Amendment 1 to - Integrated Services Digital Network (ISDN); Telephony 7 kHz and videotelephony teleservices; Digital Subscriber Signalling System No. one (DSS1) protocol; Part 1: Protocol specification
Amendment by European Telecommunications Standards Institute, 03/01/1996
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