ETSI TS 122 001
- Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); Principles of circuit telecommunication services supported by a Public Land Mobile Network (PLMN) (3GPP TS 22.001 version 4.2.0 Release 4)
- standard by European Telecommunications Standards Institute, 07/01/2001
- Publisher: ETSI
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