ETS 300137:1992-05

Integrated Services Digital Network (ISDN); Closed User Group (CUG) supplementary service; functional capabilities and information flows

German title: ISDN; Dienstmerkmal Geschlossene Benutzergruppe; Funktionelle Fähigkeiten und Informationsflüsse
Publication date: 1992-05
Original language: English
Pages: 34

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