ETSI TS 122 053
- Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); Tandem Free Operation (TFO); Service Description - Stage 1 (3GPP TS 22.053 version 4.0.1 Release 4)
- standard by European Telecommunications Standards Institute, 10/01/2001
- Publisher: ETSI
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