DIN ETS 300443-1:1996-12
Отменен
Broadband Integrated Services Digital Network (B-ISDN) - Digital Subscriber Signalling System No. two (DSS2) protocol; B-ISDN user-network interface layer 3 specification for basic call/bearer control - Part 1: Protocol specification (ITU-T Q.2931:1995, modified); English version ETS 300443-1:1996
