Integrated Services Digital Network (ISDN); user-network interface layer 3; specifications for basic call control; English version ETS 300102-1:1990/A2:1993
Integrated Services Digital Network (ISDN) - Connected Line Identification Restriction (COLR) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol - Part 4: Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) proforma specification for the user (Endorsement of the English version EN 300098-1 V 1.2.4 (1998-06) as German standard)— 1 стр.
