ETSI ETS 300 356-31 Integrated Services Digital Network (ISDN); Signalling System No.7; ISDN User Part (ISUP) version 2 for the international interface; Part 31: Protocol Implementation Conformance Statement (PICS) proforma specification for basic services [ITU-T Recommendation Q.784.2, clauses 2, 3 and 9, and annex A,

standard by European Telecommunications Standards Institute, 12/01/1997