2 References

22.0533GPPRelease 17Service descriptionStage 1Tandem Free Operation (TFO)TS

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[1] ITU-T Recommendations I.130 (1988): "Method for the characterization of telecommunication services supported by an ISDN and network capabilities of an ISDN".

[2] GSM 01.04: "Digital cellular telecommunications system (Phase 2+); Abbreviations and acronyms".