ETSI EN 300 403-7 English Printed Edition English PDF Integrated Services Digital Network (ISDN); Digital Subscriber Signalling System No. one (DSS1) protocol; Signalling network layer for circuit-mode basic call control; Part 7: Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) proforma specification f

standard published 02/01/2000 by European Telecommunications Standards Institute