ETSI TS 101 504

Digital cellular telecommunications system (Phase 2 ) (GSM); Inband Tandem Free Operation (TFO) of Speech Codecs; Service Description; Stage 3 (GSM 08.62 version 7.1.0 Release 1998) Edition: 7.1.0
European Telecommunications Standards Institute / 01-Apr-2000 / 70 pages

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This standard specifies the stage 3 description for the Tandem Free Op eration feature which provides the capability to avoid using two GSM s peech codecs in mobile to mobile speech calls. The primary aim is to realise improvements in speech quality. The TFO mode of operation cou ld also be used to reduce inter-MSC transmission bandwidth requirement s.