EN 300 356-33 : 4.1.1

INTEGRATED SERVICE DIGITAL NETWORK (ISDN); SIGNALLING SYSTEM NO. 7 (SS7); ISDN USER PART (ISUP) VERSION 4 FOR THE INTERNATIONAL INTERFACE; PART 33: ABSTRACT TEST SUITE (ATS) AND PARTIAL PROTOCOL IMPLEMENTATION EXTRA INFORMATION FOR TESTING (PIXIT) PROFORMA SPECIFICATION FOR BASIC SERVICES

European Telecommunications Standards Institute