DIN ETS 300056:1992-09 Integrated Services Digital Network (ISDN); Call Waiting (CW) supplementary service; service description; english version ETS 300056:1991

标准编号：DIN ETS 300056:1992-09

英文标题：Integrated Services Digital Network (ISDN); Call Waiting (CW) supplementary service; service description; english version ETS 300056:1991

德文标题：ISDN; Dienstmerkmal Anklopfen; Dienstbeschreibung; Englische Fassung ETS 300056:1991

发布日期：1992-09

标准预览图