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ETSI ETS 300 267-6
M00000214
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ETSI ETS 300 267-6 Integrated Services Digital Network (ISDN); Telephony 7 kHz and videotelephony teleservices; Digital Subscriber Signalling System No. one (DSS1) protocol; Part 6: Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) proforma specification for the networ
standard by European Telecommunications Standards Institute, 04/01/1998
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