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ETSI ETS 300 122-2
M00001035
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ETSI ETS 300 122-2 Integrated Services Digital Network (ISDN); Generic keypad protocol for the support of 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, 08/01/1996
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