DIN EN 300093-4 (2002-12)现行
Integrated Services Digital Network (isdn) - Digital Subscriber Signalling System No. One (dss1) Protocol - Calling Line Identification Restriction (clir) Supplementary Service - Part 4: Abstract Test Suite (ats) And Partial Protocol Implementation Extra Information For Testing (pixit) Proforma Specification For The User
出版：German Institute for Standardisation (Deutsches Institut für Normung)
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