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ETSI ETS 300 754-1
M00000571
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ETSI ETS 300 754-1 Integrated Services Digital Network (ISDN); Signalling System No.7; Transaction Capabilities (TC); Application Service Element (ASE) for Message Waiting Indication (MWI) supplementary service; Part 1: Protocol specification
standard by European Telecommunications Standards Institute, 07/01/1997
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