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ETSI ETS 300 267-1
M00000727
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ETSI ETS 300 267-1 Integrated Services Digital Network (ISDN); Telephony 7 kHz and videotelephony teleservices; Digital Subscriber Signalling System No. one (DSS1) protocol; Part 1: Protocol specification
standard by European Telecommunications Standards Institute, 02/01/1994
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