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Spec #CR #Revision #Impacted VersionTarget ReleaseTitleWG TDoc #WG statusTSG TDoc #TSG statusNew Version
02.53A001- R1998to GSM 02.53 Modifications to Annex A (informative): Limitations of initial in-band TFO implementations273/97agreed97-950approved 
02.530002- Rel-4Extension of TFO to AMRS4-010256agreedSP-010098approved 
02.530000- R1998Tandem Free Operation Stage 1172/97agreed97-739approved