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DIN ETS 300091
Integrated Services Digital Network (ISDN); Calling Line Identification Presentation (CLIP) and Calling Line Identification Restriction (CLIR) supplementary services; functional capabilities and information flows; english version ETS 300091:1992
Edition
1992-12
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
