DIN ETS 300140:1992-12 Integrated Services Digital Network (ISDN); Call Hold (HOLD) supplementary service; functional capabilities and information flows; english version ETS 300140:1992

标准编号：DIN ETS 300140:1992-12

英文标题：Integrated Services Digital Network (ISDN); Call Hold (HOLD) supplementary service; functional capabilities and information flows; english version ETS 300140:1992

德文标题：ISDN; Dienstmerkmal Halten; Funktionelle Fähigkeiten und Informationsflüsse; Englische Fassung ETS 300140:1992

发布日期：1992-12

DIN ETS 300140:1992-12 Integrated Services Digital Network (ISDN); Call Hold (HOLD) supplementary service; functional capabilities and information flows; english version ETS 300140:1992

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