Integrated Services Digital Network (ISDN) - Message Waiting Indication (MWI) supplementary service - Service description (Endorsement of the English version EN 300650 V 1.2.1 (2001-05) as German standard)— 1 стр.
Integrated Services Digital Network (ISDN); Message Waiting Indication (MWI) supplementary service - Service description (Endorsement of the English version ETS 300650:1998 as German standard)
