ETSI ETS 300 604
ETSI ETS 300 604
Digital cellular telecommunications system (Phase 2) (GSM); General requirements on interworking between the Public Land Mobile Network (PLMN) and the Integrated Services Digital Network (ISDN) or Public Switched Telephone Network (PSTN) (GSM 09.07 version 4.13.1)
standard published 03/01/1999 by European Telecommunications Standards Institute
