ETSI EN 301 060-5 English Printed Edition English PDF Integrated Services Digital Network (ISDN); Digital Subscriber Signalling System No. one (DSS1) protocol; Basic call control; Enhancement at the b service entry point for Virtual Private Network (VPN) applications; Part 5: Test Suite Structure and Test Purposes (TSS&TP) specification for the network

standard published 11/01/1998 by European Telecommunications Standards Institute