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ETSI EN 301 001-2
M00000015
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ETSI EN 301 001-2 Integrated Services Digital Network (ISDN); Outgoing Call Barring (OCB) supplementary services; Digital Subscriber Signalling System No. one (DSS1) protocol; Part 2: Protocol Implementation Conformance Statement (PICS) proforma specification
standard by European Telecommunications Standards Institute, 08/01/1998
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