ETSI EN 301 144-4 English Printed Edition English PDF Integrated Services Digital Network (ISDN); Digital Subscriber Signalling System No. one (DSS1) and Signalling System No.7 protocols; Signalling application for the mobility management service on the alpha interface; Part 4: Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Informa

standard published 05/01/2000 by European Telecommunications Standards Institute