D.1 Scope

28.0623GPPInband Tandem Free Operation (TFO) of speech codecsService descriptionStage 3TS

This Annex D describes the mandatory and optional actions within the Transcoder (TC) and the MSC Server in 3G for Tandem Free Operation in 3G-3G calls and in 3G-2G calls.
Note: The actions within the MSC Server are harmonised with the Out-of-Band Transcoder Control (OoBTC) for Transcoder Free Operation (TrFO).