DIN ETS 300356-1:1995-11
Отменен
Integrated Services Digital Network (ISDN) - Signalling System No. 7; ISDN User Part (ISUP) version 2 for the international interface - Part 1: Basic services [ITU-T Recommendations Q.761 to Q.764 (1993), modified]; English version ETS 300356-1:1995
