EN 300 064-6 : 1.4.3

INTEGRATED SERVICES DIGITAL NETWORK (ISDN) - DIRECT DIALLING IN (DDI) SUPPLEMENTARY SERVICE - DIGITAL SUBSCRIBER SIGNALLING SYSTEM NO. ONE (DSS1) PROTOCOL - PART 6: ABSTRACT TEST SUITE (ATS) AND PARTIAL PROTOCOL IMPLEMENTATION EXTRA INFORMATION FOR TESTING (PIXIT) PROFORMA SPECIFICATION FOR THE NETWORK

European Telecommunications Standards Institute