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DIN ETS 300523
European digital cellular telecommunications system (Phase 2) - Numbering, addressing and identification; English version ETS 300523:1995
Edition
1995-09
DIN ETS 300181
Integrated Services Digital Network (ISDN); Advice of Charge (AOC) supplementary service; functional capabilities and information flows; English version ETS 300181:1993
Edition
1994-01
