ETSI TS 129 007

ETSI TS 129 007 Digital cellular telecommunications system (Phase 2+) (GSM); UMTS; General requirements on interworking between the Public Land Mobile Network (PLMN) and the Integrated Services Digital Network (ISDN) or Public Switched Telephone Network (PSTN) (3GPP TS 29.007 version 12.1.0 Release 12)

standard by European Telecommunications Standards Institute, 01/01/2019