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ETSI ETS 300 141-5
M00000947
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ETSI ETS 300 141-5 Integrated Services Digital Network (ISDN); Call Hold (HOLD) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol; Part 5: Test Suite Structure and Test Purposes (TSS&TP) specification for the network
standard by European Telecommunications Standards Institute, 10/01/1996
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