prBAS ETS 300 356-33 V:2027

Integrated Services Digital Network (ISDN); Signalling System No.7; ISDN User Part (ISUP) version 2 for the international interface; Part 33: Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) proforma specification for basic services [ITU-T Recommendation Q.784.2, clauses 2 to 4 and annexes B to D, modified]