Foreword1 Scope2 References3 Definitions, symbols and abbreviations4 Main Concept5 General Architecture6 Procedure Descriptions7 Information element contents8 Protocol version identification9 Operational AspectsA.1 IntroductionA.2 Sh message to Diameter command mappingA.3 VoidB.1 Message flowsC.1 General descriptionC.2 PublicIdentifiersC.3 Sh-IMS-DataC.3 Sh-IMS-DataF.1 GeneralF.2 HSS behaviourF.3 AS behaviourG.1 Message prioritizationH.1 GeneralI.1 GeneralI.2 Sh/Dh interfaceJ.1 GeneralJ.2 HSS behaviourJ.3 AS behaviour A.3 Void 29.3283GPPIP Multimedia (IM) Subsystem Sh interfaceRelease 18Signalling flows and message contentsTS Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM Annex B (informative): Message flow