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DIN ETS 300137
Integrated Services Digital Network (ISDN); Closed User Group (CUG) supplementary service; functional capabilities and information flows; english version ETS 300137:1992
Edition
1992-12
DIN ETS 300102-1
Integrated Services Digital Network (ISDN); user-network interface layer 3; specification for basic call control; english version ETS 300102-1:1990
Edition
1992-02