DIN ETS 300646-1:1998-04
Отменен
Integrated Services Digital Network (ISDN) - Signalling System No. 7; digital cellular telecommunications system (phase 2); application of ISDN User Part (ISUP) version 2 for the ISDN - Public Land Mobile Network (PLMN) signalling interface - Part 1: Protocol specification (GSM 09.12 version 4.1.1); English version ETS 300646-1:1997
