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ETSI ETS 300 058-2
M00000267
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ETSI ETS 300 058-2 Integrated Services Digital Network (ISDN); Call Waiting (CW) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol; Part 2: Protocol Implementation Conformance Statement (PICS) proforma specification
standard by European Telecommunications Standards Institute, 09/01/1995
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