OENORM EN 302646-2 V 7.1.1
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 2: Protocol Implementation Conformance Statement (PICS) proforma specification