Integrated Services Digital Network (ISDN) - Signalling System No. 7; Interworking between ISDN User Part (ISUP) version 2 and Digital Subscriber Signalling System No. one (DSS1) - Part 3: Test Suite Structure and Test Purposes (TSS&TP) specification (Endorsement of the English version EN 300899-3 V 1.1.1 (2001-09) as German Standard)