Standards
[CURRENT]
DIN ETS 300062
DIN ETS 300062
Integrated Services Digital Network (ISDN); Direct Dialling In (DDI) supplementary service; service description; english version ETS 300062:1991
Title (German)
ISDN; Dienstmerkmal Durchwahl; Dienstbeschreibung; Englische Fassung ETS 300062:1991