UNE-EN 302646-4V7.0.1

Integrated Services Digital Network (ISDN);Signalling System No.7 (SS7);Digital cellular telecommunications system (Phase 2+);Application of ISDN User Part (ISUP) version 3 for the ISDN-Public Land Mobile Network (PLMN) signalling interface;Part 4: Abstract Test Suite (ATS) and Protocol Implementation eXtra Information for Testing (PIXIT) proforma specification (Endorsed by Asociación Espanola de Normalización in January of 2022.)