UNE-ETS 300646-4ED1

Integrated Services Digital Network (ISDN);Signalling System No.7;Digital cellular telecommunications system (Phase 2);Application of ISDN User Part (ISUP) version 2 for the ISDN-Public Land Mobile Network (PLMN) signalling interface;Part 4: Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) proforma specification (Endorsed by Asociación Espanola de Normalización in December of 2022.)