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ETS 300056:1991-10

Integrated Services Digital Network (ISDN); Call waiting (CW) supplementary service; service description

German title
ISDN; Dienstmerkmal Anklopfen; Dienstbeschreibung
Publication date
1991-10
Original language
English
Pages
16
Publication date
1991-10
Original language
English
Pages
16

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Replacement amendments

This document has been modified by: ETS 300056/A1:1996-09

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