PREN 300 058-6 V1.2.3 (1998)被替代
Integrated Services Digital Network (isdn); Call Waiting (cw) Supplementary Service;digital Subscriber Signalling System No. One (dss1) Protocol; Part 6: Abstract Test Suite (ats) And Partial Protocol Implementation Extra Information For Testing (pixit) Proforma Specification For The Network
出版：European Telecommunications Standards Institute
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