EN 300 064-4 : 1.3.4

INTEGRATED SERVICES DIGITAL NETWORK (ISDN) - DIRECT DIALLING IN (DDI) SUPPLEMENTARY SERVICE - 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

European Telecommunications Standards Institute