ÖNORM EN 300356-33 V 4.1.1:2003-09
Действует
Integrated Service Digital Network (ISDN) - Signalling System No.7 (SS7) - ISDN User Part (ISUP) version 4 for the international interface - Part 33: Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) proforma specification for basic services (incl. CD-ROM!!!)
