ETSI TS 129 007

Digital cellular telecommunications system (Phase 2 ) (GSM); Universal Mobile Telecommunications System (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 2 Edition: 3.7.0
European Telecommunications Standards Institute / 01-Dec-2000 / 75 pages