DIN ETS 300356-2:1995-11
Отменен
Integrated Services Digital Network (ISDN) - Signalling System No. 7; ISDN User Part (ISUP) version 2 for the international interface - Part 2: ISDN supplementary services [ITU-T Recommandation Q.730 (1993), modified]; English version ETS 300356-2:1995
