ForewordIntroduction1 Scope2 References3 Definitions and abbreviations4 Description5 Normal Procedures6 CTS de-activation7 Exceptional procedures8 Charging aspects9 Cross Phase Compatibility 7 Exceptional procedures 3GPP42.056GSM Cordless Telephony System (CTS), Phase 1Release 17Service descriptionStage 1TS Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM None identified.