ETSI PRETS 300 102-2-1990 Integrated Services Digital Network (ISDN): User-Network Interface Layer 3 Specification Description Language (SDL) Diagrams was changed to ETSI ETS 300 102-2-1990 Integrated Services Digital Network (ISDN); User-Network Interface Layer 3 Specifications for Basic Call Control Specification Description Language (SDL) Diagrams.
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