ETSI EN 301 002-4
ETSI EN 301 002-4
Integrated Services Digital Network (ISDN); Security tools (SET) procedures; 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
standard published 05/01/2000 by European Telecommunications Standards Institute