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ETSI EN 300 210-2
M00000118
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ETSI EN 300 210-2 Integrated Services Digital Network (ISDN); Freephone (FPH) 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, 06/01/1998
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