ForewordIntroduction1 Scope2 References3 Definitions and abbreviations4 Void4a Architecture Requirements5 Architecture model and reference points6 Procedures6.0 General6.0a SMS without MSISDN in IMS6.1 Registration procedure6.2 De-registration procedure6.3 Transport-level interworking: Successful encapsulated Short Message origination procedure with MSISDN6.3a Transport-level interworking: Short Message origination procedure without MSISDN6.4 Transport-level interworking: Successful encapsulated Short Message termination procedure from SMS-GMSC6.4a Transport-level interworking: Short Message termination procedure without MSISDN from IMS network6.5 Transport-level interworking: Delivery Report procedure6.5a Unsuccessful SM termination procedure6.5b Alert Service Centre procedure when UE is available6.6 Transport-level interworking: Alert service centre procedure when memory capacity is available6.7 Service-level Interworking: IM or CPM capable UE sends an Instant Message to an SMS user6.8 Interaction between transport-level and service-level Interworking6.9 Service-level Interworking: Concatenated Short Messages delivered as a large Instant Message6.10 Service-level interworking: Status Report procedure for Instant Message to Short Message interworking6.11 IM or CPM user sends an Instant Message to an SMSIP UE6.12 Delivery report for an Instant Message delivered as encapsulated Short Message6.13 Service-level interworking: IM or CPM capable UE sends an Instant Message to an SMS user with Interworking in the terminating side6.14 Service-level interworking: IM or CPM user receives Short Message from an SMS user6.15 Service-level Interworking: CPM capable UE sends a Chat session invitation to an SMS user6.16 Service-level Interworking: CPM capable UE tearing down a Chat session between a CPM user and an SMS user6.17 Service-level Interworking: SMS user requesting the IP-SM-GW to tear down the Chat session between a CPM user and an SMS user6.18 Service-level interworking: Status Report procedure for chat session message to Short Message interworkingB.1 Service-level interworking: IM or CPM user initiates a group chat and sends an Instant Message to a group list including SMS usersB.2 Service-level interworking: CPM user extends a one-to-one chat session into a group chat sessionB.3 Service-level interworking: IP-SM-GW informs SMS users about group chat participant changes 4 Void 23.2043GPPRelease 17Stage 2Support of Short Message Service (SMS) over generic 3GPP Internet Protocol (IP) accessTS Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM