ETSI TS 122 053
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 published 10/01/2001 by European Telecommunications Standards Institute