UNE-ETS 300356-33ED1

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] (Endorsed by Asociación Espanola de Normalización in June of 2022.)