Note that this page shows only those active (i.e. not yet completed) WIs where C3 is the sole responsible group.
There may be other active WIs for which this group holds joint responsibility, particularly hierachically higher WIs which comprise WIs from several groups: such WIs are not shown on this page.
| Feature or Study Item: DIAMETER on the PDG Wi interface | DIAMWi | Rel-7 |
| Feature or Study Item: DIAMETER on the GGSN Gi interface | DIAMGi | Rel-7 |
| Work task: CT3 aspets for WLAN-PNA | WLANPNA-st3 | Rel-7 |
| Work task: Deleted - CT3 IMS aspects to support IMS Emergency sessions | EMC1 | Rel-7 |
| Building Block: Gx reference point for Policy and Charging Control | PCC-Gx | Rel-7 |
| Building Block: Rx reference point for PCC CT3 aspects | PCC-Rx | Rel-7 |
| Building Block: WLAN-PNA - Stage 3 | WLANPNA-st3 | Rel-7 |
| Building Block: TISPAN Rel 1 related aspects | FBI-TIS1 | Rel-7 |
| Feature or Study Item: Multimedia interworking between IMS and CS networks | MIW-IMS | Rel-8 |
| Feature or Study Item: IP Interconnection of Services | IPinterc | Rel-8 |
| Building Block: Maintenance of TISPAN R2 | MAINT_R2 | Rel-8 |
| Building Block: Call Completion on Busy Subscriber (CCBS)/Call Completion on Non-Reachable (CCNR) on IMS | CCBS_CCNR | Rel-8 |
| Work task: CT3 part of Stage 3 CCBS_CCNR | CCBS_CCNR | Rel-8 |
| Building Block: Communication Wait on IMS | CW_IMS | Rel-8 |
| Work task: CT3 part of Stage 3 CW-IMS | CW_IMS | Rel-8 |
| Feature or Study Item: Interworking between User-to-User Signalling (UUS) and SIP | UUSIW | Rel-8 |
| Building Block: CT3 part of Stage 3 MGCF UUSIW | UUSIW | Rel-8 |
| Feature or Study Item: Support of Overlap signalling | Overlap | Rel-8 |
| Building Block: Stage 3 Overlap (CT3) | Overlap | Rel-8 |
| Building Block: Stage 3 for MW-IMS, MONA extension | MIW-IMS-St3C3_MONA | Rel-8 |
| Work task: CT3 aspects of PktCbl-Sec | PktCbl-Sec | Rel-8 |
| Building Block: CT3 part of Enhancement of interworking between MTSI and CS networks | MTSI_eMHI | Rel-8 |
| Work task: Deleted - CT3 part of Service Level Tracing in IMS | OAM8-Trace | Rel-8 |
| Building Block: Core Network Impacts for A-Interface User Plane over IP | AoIP-CN | Rel-8 |
| Feature or Study Item: Encoding formats, transport formats and media description signalling for interworking, QoE, and other enhancements to MTSI-MHI | MTSI_eMHI | Rel-8 |
| Work task: IMS inter-operator service interconnection interface | FBI2-IOPSI | Rel-8 |
| Feature or Study Item: Support of (G)MSC-S – (G)MSC-S Nc Interface based on the SIP-I protocol | SIP_Nc | Rel-8 |
| Building Block: Interworking between the 3GPP CS domain with SIP-I as signalling protocol and other networks | SIP_Nc-St3C3 | Rel-8 |
| Work task: Stage 3 SAE impact on existing capabilities | SAES | Rel-8 |
| Feature or Study Item: Multimedia Priority Service | PRIOR_EMR | Rel-8 |
| Building Block: IMS Enhancements for Security Requirements in Support of Cable Deployments | PktCbl-Sec | Rel-8 |
| Building Block: Deleted - CT aspects of SAES | SAES-St3 | Rel-8 |
| Work task: Stage 3 PCC within SAE | SAES-St3-PCC | Rel-8 |
| Work task: Stage 3 EPC interworking with external PDNs (SGi) | SAES-St3-intwk | Rel-8 |
| Work task: Stage 3 for QoS mechanisms | SAES-LTE | Rel-8 |
| Feature or Study Item: AoIP (A-interface over IP) | AoIP | Rel-8 |
| Feature or Study Item: 3GPP System Architecture Evolution Specification - Evolved Packet System (non RAN aspects) | SAES | Rel-8 |
| Feature or Study Item: IMS – Interconnection Border Control Function (IBCF) – Transition Gateway (TrGW); Ix Interface; Stage 3 | IMS_IBCF | Rel-9 |
| Building Block: CT3 aspects of CS-IBCF and CS-TrGW definition in 3GPP specifications | CS-IBCF | Rel-9 |
| Building Block: CT3 part of IMS – Interconnection Border Control Function (IBCF) – Transition Gateway (TrGW); Ix Interface; Stage 3 | IMS_IBCF | Rel-9 |
| Building Block: CN aspects of Enabling Coder Selection and Rate Adaptation for UTRAN and E-UTRAN for Load Adaptive Applications | ECSRA_LAA-CN | Rel-10 |
| Building Block: Stage 3 on enhancements for Multimedia Priority Service | eMPS-CN | Rel-10 |
| Building Block: Stage 3 for S2b Mobility based on GTP | SMOG-St3 | Rel-10 |
| Building Block: Deleted - CT3 aspects of Local Call Local Switch | LCLS-CN | Rel-10 |
| Feature or Study Item: Multi Access PDN Connectivity | MAPCON | Rel-10 |
| Building Block: CT3 part of Stage 3 for Completion of Communications on Not Logged-in | CCNL | Rel-10 |
| Building Block: Stage 3 for IP Flow Mobility and seamless WLAN offload | IFOM-CT | Rel-10 |
| Building Block: Stage 3 for Optimal Media Routing | OMR | Rel-10 |
| Feature or Study Item: Study on Policy and Charging Rules Function (PCRF) failure and restoration | FS_PCRF-FR | Rel-10 |
| Feature or Study Item: IP-Short-Message-Gateway enhancements for CPM-SMS Interworking | CPM-SMS | Rel-10 |
| Feature or Study Item: Completion of Communications on Not Logged-in | CCNL | Rel-10 |
| Building Block: Stage 3 for IP-Short-Message-Gateway enhancements for CPM-SMS Interworking | CPM-SMS | Rel-10 |
| Feature or Study Item: Enhancements for Multimedia Priority Service | eMPS | Rel-10 |
| Feature or Study Item: QoS Control Based on Subscriber Spending Limits | QoS_SSL | Rel-11 |
| Feature or Study Item: Advanced IP Interconnection of Services | IPXS | Rel-11 |
| Feature or Study Item: System Improvements to Machine-Type Communications | SIMTC | Rel-11 |
| Feature or Study Item: Service Identification for RRC Improvements in GERAN (Stage 2/3) | SIRIG | Rel-11 |
| Building Block: Stage 3 for Advanced IP Interconnection of Services | IPXS | Rel-11 |
| Building Block: BB1: Stage 3 (CS+PS) Reachability Aspects of SIMTC | SIMTC-ReachCSPS | Rel-11 |
| Building Block: Stage 3 for IMS Overload Control | IOC | Rel-11 |
| Work task: CT3 part of Stage 3 for IMS Overload Control | IOC | Rel-11 |
| Work task: CT3 part of CT aspects of Roaming Architecture for Voice over IMS with Local Breakout | RAVEL-CT | Rel-11 |
| Work task: Deleted - CT3 part of CN aspects of Service Identification for RRC Improvements in GERAN | SIRIG | Rel-11 |
| Building Block: CT aspects of Roaming Architecture for Voice over IMS with Local Breakout (Stage 3) | RAVEL-CT | Rel-11 |
| Feature or Study Item: Roaming Architecture for Voice over IMS with Local Breakout | RAVEL | Rel-11 |
| Work task: CT3 part of Stage 3 BB I: BBF interworking with home routed traffic for WLAN and H(e)NB | BBAI_BBI-CT | Rel-11 |
| Work task: CT3 part of Stage 3 BB II: BBF interworking with offload in access network for WLAN and for H(e)NB | BBAI_BBII-CT | Rel-11 |
| Work task: CT3 part for Single Radio Voice Call Continuity from UTRAN/GERAN to E-UTRAN/HSPA | rSRVCC-CT | Rel-11 |
| Feature or Study Item: Indication of NNI Routeing scenarios in SIP requests | NNI_RS | Rel-12 |
| Feature or Study Item: Representational State Transfer (REST) reference point between Application Function (AF) and Protocol Converter (PC) | REST_AF_PC | Rel-12 |
| Building Block: CT aspects of Group Communication System Enablers for LTE | GCSE_LTE-CT | Rel-12 |
| Feature or Study Item: Overload Control for PCC based Diameter applications | DOCME-PCC | Rel-12 |
| Work task: CT3 part of Group Communication System Enablers for LTE | GCSE_LTE-CT | Rel-12 |
| Building Block: CT3 part of Overload Control for PCC based Diameter applications | DOCME-PCC | Rel-12 |
| Work task: CT3 part of CT impacts of codec for Enhanced Voice Services | EVS_codec-CT | Rel-12 |
| Feature or Study Item: Network-provided Location information for IMS Trusted WLAN Access Network (TWAN) case | NETLOC_TWAN | Rel-12 |
| Work task: Stage 3 for BB1: Small Data and Device Triggering Enhancements | MTCe-SDDTE-CT | Rel-12 |
| Feature or Study Item: Interactive Connectivity Establishment (ICE, IETF RFC 5245) impacts on IMS H.248 profiles | ICEH248 | Rel-12 |
| Building Block: CT aspects of Core Network Overload – User Location Information reporting improvements | CNO_ULI-CT | Rel-12 |
| Feature or Study Item: Support of ALT-C attribute | ALTC | Rel-12 |
| Work task: CT3 part of Stage 3 for BB1: Small Data and Device Triggering Enhancement | MTCe-SDDTE-CT | Rel-12 |
| Building Block: CT3 part of ICE impacts on IMS H.248 profiles (Stage 2) | ICEH248 | Rel-12 |
| Work task: CT3 part of CT aspects of Proximity-based Services | ProSe-CT | Rel-12 |
| Building Block: CT3 aspects of Usage Monitoring Control PCC enhancement (Stage 3) | UMONC-CT3 | Rel-12 |
| Building Block: CT3 aspects of Application Based Charging (Stage 3) | ABC-CT3 | Rel-12 |
| Work task: CT3 part of CT aspects of End-to-End Multimedia Telephony Service for IMS (MTSI) extensions | E2EMTSI-CT | Rel-12 |
| Building Block: CT aspects of Coordination of Video Orientation | CVO-CT | Rel-12 |
| Building Block: CT aspects of End-to-End Multimedia Telephony Service for IMS (MTSI) extensions | E2EMTSI-CT | Rel-12 |
| Building Block: CT3 part of Single Radio Voice Call Continuity (SRVCC) before ringing | bSRVCC | Rel-12 |
| Feature or Study Item: CT aspects of Signalling of Image Size (Stage 2/3) | SIS_CT | Rel-12 |
| Feature or Study Item: IMS Centralized Services (ICS) InterWorking Enhancement in Mobile Switching Center Server (MSC-S) | ICS_IWE | Rel-12 |
| Building Block: Stage 3 for Dual Radio VCC enhancements | eDRVCC | Rel-12 |
| Feature or Study Item: Group Communication System Enablers for LTE | GCSE_LTE | Rel-12 |
| Feature or Study Item: Policy and Charging Control for supporting fixed broadband access networks | P4C | Rel-12 |
| Feature or Study Item: IMS Business Trunking for IP-PBX in Static Mode of Operation | BusTI | Rel-12 |
| Feature or Study Item: Coordination of Video Orientation | CVO | Rel-12 |
| Feature or Study Item: Extended IMS media plane security features | eMEDIASEC | Rel-12 |
| Work task: CT3 part of CT aspects of Extended IMS media plane security features | eMEDIASEC-CT | Rel-12 |
| Feature or Study Item: Single Radio Voice Call Continuity (SRVCC) before ringing (Stage 3) | bSRVCC | Rel-12 |
| Feature or Study Item: IMS Stage 3 IETF Protocol Alignment - phase 6 | IMSProtoc6 | Rel-12 |
| Building Block: CT3 part of IMS Stage 3 IETF Protocol Alignment - phase 6 | IMSProtoc6 | Rel-12 |
| Feature or Study Item: Study on Indication of Network to Network Interface (NNI) Routeing scenarios in SIP requests | FS_NNI_RS | Rel-12 |
| Feature or Study Item: Usage Monitoring Control PCC enhancement | UMONC | Rel-12 |
| Building Block: CT3 aspects of Controlling IMS Media Plane with SDP Capability | SDPCN_IMS | Rel-13 |
| Building Block: CT3 aspects of Message interworking during PS to CS SRVCC | mSRVCC | Rel-13 |
| Feature or Study Item: User Plane Congestion management | UPCON | Rel-13 |
| Building Block: CT3 part of Support of RTP / RTCP multiplexing (signalling) in IMS | RTCP_MUX | Rel-13 |
| Work task: CT3 aspects of system architecture enhancements for TV service | AE_enTV-CT | Rel-14 |
| Building Block: deleted -CT3 aspects of MTSI Extension on Multi-stream | MMCMH-CT | Rel-14 |
| Work task: CT3 aspects of MMCMH_Enh | MMCMH_Enh-CT | Rel-14 |
| Work task: CT3 aspects for Non-IP for Cellular Internet of Things for EC-EGPRS | NonIP_GPRS-CT | Rel-14 |
| Building Block: CT3 aspects of IMS Stage-3 IETF Protocol Alignment | IMSProtoc8 | Rel-14 |
| Work task: CT3 aspects for PWDIMS | PWDIMS-CT | Rel-14 |
| Building Block: CT aspects of EVS in 3G Circuit-Switched Networks | EVSoCS-CT | Rel-13 |
| Building Block: CT aspects of Double Resource Reuse for Multiple Media Sessions | DRuMS-CT | Rel-13 |
| Building Block: CT3 Aspect of Usage Monitoring Control extension | eUMONC-CT3 | Rel-13 |
| Building Block: CT3 aspects of Interworking solution for Called IN number and original called IN number ISUP parameters | INNB_IW | Rel-13 |
| Feature or Study Item: Interworking solution for Called IN number and original called IN number ISUP parameters | INNB_IW | Rel-13 |
| Work task: CT3 part of CT aspects of User Plane Congestion Management for BB1 | UPCON-DOTCON-CT | Rel-13 |
| Work task: CT aspects of User Plane Congestion Management for BB1 | UPCON-DOTCON-CT | Rel-13 |
| Building Block: CT aspects of voice over E-UTRAN Paging Policy Differentiation | voE_UTRAN_PPD-CT | Rel-13 |
| Feature or Study Item: Support of EVS in 3G Circuit-Switched networks | EVSoCS | Rel-13 |
| Feature or Study Item: QoS End-to-end Multimedia Telephony Service for IMS (MTSI) extensions (Stage 3) | QOSE2EMTSI | Rel-13 |
| Feature or Study Item: voice over E-UTRAN Paging Policy Differentiation | voE_UTRAN_PPD | Rel-13 |
| Work task: CT3 Aspects of Determination of Completeness of Charging Information in IMS | CH14-DCCII-CT | Rel-14 |
| Work task: CT3 aspects of Enhancements for Mission Critical Push To Talk | MCImp-eMCPTT-CT | Rel-14 |
| Work task: CT3 aspects of MCData | MCImp-MCDATA-CT | Rel-14 |
| Work task: CT3 aspects 3 of MCVideo | MCImp-MCVIDEO-CT | Rel-14 |
| Work task: CT3 aspects of PS Data Off | PS_DATA_OFF-CT | Rel-14 |
| Building Block: CT3 Aspect of Flexible Mobile Service Steering | FMSS-CT | Rel-13 |
| Work task: CT3 aspects of Support of Emergency services over WLAN – phase 1 | SEW1-CT | Rel-13 |
| Building Block: CT3 aspects for EPC Signalling Improvements for race scenarios | EPC_SIG_RACE | Rel-13 |
| Work task: CT3 aspects for MCPTT protocol aspects | MCPTT-CT | Rel-13 |
| Work task: CT3 aspects for Enhancements to WebRTC interoperability | eWebRTCi-CT | Rel-13 |
| Work task: CT3 aspects of extended DRX cycle | eDRX-CT | Rel-13 |
| Building Block: CT aspects of MBMS Enhancements | MBMS_enh-CT | Rel-13 |
| Building Block: CT3 aspects of DiaPri | DiaPri | Rel-13 |
| Work task: CT3 aspects of MBMS enhancements | MBMS_enh-CT | Rel-13 |
| Work task: CT3 aspects of CIoT | CIoT-CT | Rel-13 |
| Feature or Study Item: Support of Real-time Transport Protocol (RTP) / Real-time Transport Control Protocol (RTCP) multiplexing (signalling) in IMS | RTCP_MUX | Rel-13 |
| Building Block: CT aspects of Architecture Enhancements for Service capability Exposure | AESE-CT | Rel-13 |
| Work task: CT3 aspects of Diameter Base Protocol Specification Update | DBPU | Rel-14 |
| Feature or Study Item: Interworking between a PLMN with WLAN to access the EPC and a PDN (Stage 3) | SAES_WLAN_EPC_intwk | Rel-12 |
| Building Block: CT3 aspects of IMS Stage-3 IETF Protocol Alignment | IMSProtoc7 | Rel-13 |
| Work task: CT3 part of CT aspects of voice over E-UTRAN Paging Policy Differentiation | voE_UTRAN_PPD-CT | Rel-13 |
| Building Block: CT Aspects of QoS End-to-End MTSI Extensions | QOSE2EMTSI-CT | Rel-13 |
| Work task: CT3 Aspects of QoS End-to-End MTSI Extensions | QOSE2EMTSI-CT | Rel-13 |
| Feature or Study Item: Codec for Enhanced Voice Services | EVS_codec | Rel-12 |
| Work task: CT3 aspects of Double Resource Reuse for Multiple Media Sessions | DRuMS-CT | Rel-13 |
| Work task: CT3 aspects of enhancements to Proximity-based | eProSe-Ext-CT | Rel-13 |
| Feature or Study Item: Application Based Charging | ABC | Rel-12 |
| Work task: CT3 part of Stage 3 for Dual Radio VCC enhancements | eDRVCC | Rel-12 |
| Building Block: CT3 part of eMBMS restoration procedures | eMBMS_Rest | Rel-12 |
| Building Block: CT aspects of IMS Business Trunking for IP-PBX in Static Mode of Operation (Stage 3) | BusTI-CT | Rel-12 |
| Feature or Study Item: Updating IMS to conform to RFC 6665 (Stage 3) | UP6665 | Rel-12 |
| Feature or Study Item: Study on Technical aspects on Roaming End-to-end scenarios with VoLTE IMS and other networks | FS_REVOLTE_IMS | Rel-12 |
| Work task: Stage 3 for BB1: Policy and Charging Control for supporting traffic from fixed terminals and NSWO traffic from 3GPP UEs in fixed broadband access networks | P4C-F-CT3 | Rel-12 |
| Work task: CT3 part of Stage 3 for BB1: Policy and Charging Control for supporting traffic from fixed terminals and NSWO traffic from 3GPP UEs in fixed broadband access networks | P4C-F-CT3 | Rel-12 |
| Work task: CT3 aspects of IP Flow Mobility support for S2a and S2b Interfaces | NBIFOM-CT | Rel-13 |
| Work task: CT3 aspects of Architecture Enhancements for Service capability Exposure | AESE-CT | Rel-13 |
| Work task: CT3 aspects of Monitoring Enhancements | MONTE-CT | Rel-13 |
| Work task: DELETED: CT3 aspects of Group based Enhancements | GROUPE-CT | Rel-13 |
| Work task: CT3 Aspects of Video Enhancements by Region-Of-Interest information signalling | ROI-CT | Rel-13 |
| Work task: CT3 aspects of EVS in 3G Circuit-Switched Networks | EVSoCS-CT | Rel-13 |
| Feature or Study Item: Continuation of the Overload Control for PCC based Diameter applications | cDOCME_PCC | Rel-13 |
| Work task: CT3 part of CT aspects of Coordination of Video Orientation | CVO-CT | Rel-12 |
| Building Block: CT3 part of CT Aspects of Signalling of Image Size | SIS_CT | Rel-12 |
| Feature or Study Item: Proxy Call Session Control Function (P-CSCF) restoration enhancements (Stage 2/3) | PCSCF_RES | Rel-12 |
| Building Block: CT3 aspects of MCPTTProtoc1 | MCPTTProtoc1 | Rel-14 |
| Work task: CT3 Aspects of V8 | V8-CT | Rel-14 |
| Work task: CT3 aspects of V2X Services | V2X-CT | Rel-14 |
| Building Block: CT3 aspects of SIP Reason header extension | REAS_EXT | Rel-14 |
| Work task: CT3 Aspect of AULC | AULC-CT | Rel-14 |
| Work task: CT3 Aspects of SDCI | SDCI-CT | Rel-14 |
| Work task: CT3 aspects for CUPS | CUPS-CT | Rel-14 |
| Building Block: CT3 aspects of Diameter Load Control Mechanism | DLoCMe | Rel-14 |
| Feature or Study Item: Study on XML based access of AF to the PCRF | FS_XML_AF_PCRF | Rel-12 |
| Feature or Study Item: eMBMS restoration procedures | eMBMS_Rest | Rel-12 |
| Building Block: CT3 part of IMS Emergency PSAP Callback | EMC_PC | Rel-12 |
| Feature or Study Item: IMS Emergency PSAP Callback (Stage 3) | EMC_PC | Rel-12 |
| Feature or Study Item: IMS-based Telepresence | IMS_TELEP | Rel-12 |
| Feature or Study Item: Impacts of RFC7044 for introduction of the new History-Info header field | HISTORY_CT | Rel-12 |
| Building Block: CT3 part of Impacts of RFC7044 for introduction of the new History-Info header field | HISTORY_CT | Rel-12 |
| Building Block: CT3 part of Indication of NNI Routeing scenarios in SIP requests | NNI_RS | Rel-12 |
| Building Block: PCRF based solution | PCSCF_RES | Rel-12 |
| Building Block: Common for HSS & PCRF solutions | PCSCF_RES | Rel-12 |
| Work task: CT3 part of Common for HSS & PCRF solutions | PCSCF_RES | Rel-12 |
| Building Block: CT impacts of codec for Enhanced Voice Services | EVS_codec-CT | Rel-12 |
| Work task: CT3 part of CT aspects of IMS Business Trunking for IP-PBX in Static Mode of Operation (Stage 3) | BusTI-CT | Rel-12 |
| Building Block: CT3 part of Updating IMS to conform to RFC 6665 | UP6665 | Rel-12 |
| Feature or Study Item: IMS Operator Determined Call Barring enhancements (Stage 3) | eIODB | Rel-12 |
| Building Block: CT aspects of Network-provided Location information for IMS Trusted WLAN Access Network (TWAN) case (Stage 3) | NETLOC_TWAN-CT | Rel-12 |
| Work task: CT3 part of Network-provided Location information for IMS Trusted WLAN Access Network (TWAN) case | NETLOC_TWAN-CT | Rel-12 |
| Building Block: CT3 part of IMS Operator Determined Call Barring enhancements | eIODB | Rel-12 |
| Feature or Study Item: Anonymous Call Rejection in the CS domain | ACR_CS | Rel-11 |
| Feature or Study Item: Single Radio Voice Call Continuity from UTRAN/GERAN to E-UTRAN/HSPA | rSRVCC | Rel-11 |
| Building Block: Core Network aspects of Anonymous Call Rejection in the CS domain | ACR_CS-CN | Rel-11 |
| Building Block: Stage 3 BB I - Core Network impacts: BBF interworking with home routed traffic for WLAN and H(e)NB | BBAI_BBI-CT | Rel-11 |
| Building Block: Stage 3 BB II - Core Network impacts: BBF interworking with offload in access network for WLAN and for H(e)NB | BBAI_BBII-CT | Rel-11 |
| Work task: CT3 part of Stage 3 for USSD simulation service in IMS | USSI | Rel-11 |
| Work task: CT3 aspects of Single Radio Video Call Continuity for 3G-CS | vSRVCC-CT | Rel-11 |
| Building Block: CT3 part of IMS Stage 3 IETF Protocol Alignment - phase 5 | IMSProtoc5 | Rel-11 |
| Feature or Study Item: Inclusion of Media Resource Broker (Stage 2/3) | MRB | Rel-11 |
| Work task: CT3 part of CT aspects of Core Network Overload – User Location Information reporting improvements | CNO_ULI-CT | Rel-12 |
| Work task: CT3 part of Stage 3 for Inclusion of Media Resource Broker | MRB | Rel-11 |
| Feature or Study Item: IMS Overload Control | IOC | Rel-11 |
| Building Block: CT3 part of enhanced Nodes Restoration for EPC | eNR_EPC | Rel-11 |
| Feature or Study Item: Enhanced T.38 FAX support (Stage 3) | MMTel_T.38_FAX | Rel-11 |
| Building Block: CT3 part of Enhanced T.38 FAX support | MMTel_T.38_FAX | Rel-11 |
| Work task: CT3 part of CT aspects of Network-provided Location information for IMS | NWK-PL2IMS-CT | Rel-11 |
| Feature or Study Item: Inter-IMS Network to Network Interface (II-NNI) enhancements: SIP timers applicability (Stage 3) | NNI_timers | Rel-11 |
| Building Block: CT aspects of Network-provided Location information for IMS (Stage 3) | NWK-PL2IMS-CT | Rel-11 |
| Feature or Study Item: Core Network Overload - User Location Information reporting improvement | CNO_ULI | Rel-12 |
| Building Block: CT3 part of Enhancements for Multimedia Priority Service (MPS) – Gateway Control Priority | eMPS_Gateway | Rel-11 |
| Work task: CT3 part of CN aspects of Mobility based On GTP & PMIPv6 for WLAN access to EPC | SaMOG_WLAN-CN | Rel-11 |
| Feature or Study Item: S2a Mobility based On GTP and WLAN access to EPC | SaMOG_WLAN | Rel-11 |
| Feature or Study Item: IP Flow Mobility and seamless WLAN offload | IFOM | Rel-10 |
| Feature or Study Item: Enabling Coder Selection and Rate Adaptation for UTRAN and E-UTRAN for Load Adaptive Applications | ECSRA_LAA | Rel-10 |
| Feature or Study Item: Optimal Media Routing | OMR | Rel-10 |
| Building Block: CN aspects of Mobility based On GTP & PMIPv6 for WLAN access to EPC | SaMOG_WLAN-CN | Rel-11 |
| Feature or Study Item: Enhancements for Multimedia Priority Service (MPS) – Gateway Control Priority | eMPS_Gateway | Rel-11 |
| Building Block: CN aspects of Service Identification for RRC Improvements in GERAN | SIRIG | Rel-11 |
| Feature or Study Item: Support for BroadBand Forum Accesses Interworking | BBAI | Rel-11 |
| Work task: CT3 part of Stage 3 for Advanced IP Interconnection of Services | IPXS | Rel-11 |
| Work task: CT3 part of Stage 3 BB1: Reachability Aspects of SIMTC | SIMTC-ReachCSPS | Rel-11 |
| Work task: CT3 part of Core Network aspects of Anonymous Call Rejection in the CS domain (Stage 3) | ACR_CS-CN | Rel-11 |
| Building Block: CT aspects for Single Radio Voice Call Continuity from UTRAN/GERAN to E-UTRAN/HSPA (Stage 3) | rSRVCC-CT | Rel-11 |
| Building Block: Stage 3 for Inclusion of Media Resource Broker | MRB | Rel-11 |
| Feature or Study Item: Single Radio Video Call Continuity for 3G-CS | vSRVCC | Rel-11 |
| Feature or Study Item: Service Awareness and Privacy Policies | SAPP | Rel-11 |
| Feature or Study Item: PCC enhancements | PCC-Enh | Rel-9 |
| Feature or Study Item: System aspects of vocoder rate adaptation for LTE | LTEimp-Vocoder | Rel-9 |
| Building Block: Single Radio Voice Call Continuity (SRVCC) support for IMS Emergency Calls | IMS_EMER_GPRS_EPS-SRVCC | Rel-9 |
| Building Block: BB1: Small Data and Device Triggering Enhancements (SDDTE) | MTCe-SDDTE | Rel-12 |
| Building Block: BB1: Policy and Charging Control for supporting traffic from fixed terminals and NSWO (Non Seamless WLAN Offload) traffic from 3GPP UEs in fixed broadband access networks (P4C-F) | P4C-F | Rel-12 |
| Building Block: CT part for IMS Telepresence (Stage 2/3) | IMS_TELEP | Rel-12 |
| Work task: CT3 part of IMS Telepresence (Stage 3) | IMS_TELEP | Rel-12 |
| Building Block: CT aspects of Extended IMS media plane security features (Stage 2/3) | eMEDIASEC-CT | Rel-12 |
| Feature or Study Item: IMS Media Plane Security | MEDIASEC | Rel-9 |
| Feature or Study Item: Completion of IMS Restoration Procedures | eIMS_RP | Rel-9 |
| Building Block: CT3 aspects of MBMS support in EPS (Stage 3) | MBMS_EPS | Rel-9 |
| Building Block: Stage 3 for IMS Emergency Calls over GPRS and EPS | IMS_EMER_GPRS_EPS | Rel-9 |
| Work task: CT3 aspects - Stage 3 for IMS Emergency Calls over GPRS and EPS | IMS_EMER_GPRS_EPSC3 | Rel-9 |
| Feature or Study Item: Operational description of the Inter-IMS Network to Network Interface (II-NNI) | II-NNI | Rel-9 |
| Building Block: Operational description of the Inter-IMS Network to Network Interface | II-NNI | Rel-9 |
| Feature or Study Item: Unstructured Supplementary Service Data (USSD) simulation service in IMS | USSI | Rel-11 |
| Feature or Study Item: Network-provided Location information for IMS (NETLOC) | NWK-PL2IMS | Rel-11 |
| Building Block: CT3 part of Service Awareness and Privacy Policies | SAPP-CT3 | Rel-11 |
| Building Block: Stage 3 for USSD simulation service in IMS | USSI | Rel-11 |
| Building Block: CT3 aspects of QoS Control Based on Subscriber Spending Limits (Stage 3) | QoS_SSL-CT3 | Rel-11 |
| Work task: CT3 aspects of Multi Access PDN Connectivity | MAPCON-St3 | Rel-10 |
| Feature or Study Item: CS and IMS Interworking for CAT service - Early Session model | CIIC_ES | Rel-10 |
| Feature or Study Item: S2b Mobility based on GTP | SMOG | Rel-10 |
| Work task: CT3 part of Stage 3 for Optimal Media Routeing | OMR | Rel-10 |
| Building Block: Further improvements of II-NNI Stage 3 | II-NNI2 | Rel-10 |
| Feature or Study Item: Further improvements of II-NNI Stage 3 based on operational feedback and evolution of other specifications | II-NNI2 | Rel-10 |
| Building Block: CN aspects of Single Radio Video Call Continuity for 3G-CS | vSRVCC-CT | Rel-11 |
| Feature or Study Item: Usability improvement of Inter-IMS Network to Network Interface (II-NNI) specification for inter-connection by means of Option Item list | NNI_OI | Rel-11 |
| Feature or Study Item: enhanced Nodes Restoration for EPC (Stage 2/3) | eNR_EPC | Rel-11 |
| Feature or Study Item: IMS Stage 3 IETF Protocol Alignment - phase 5 | IMSProtoc5 | Rel-11 |
| Building Block: Stage 3 for ICSRA – Protocol, Addressing, Subscriber Data | ICSRA | Rel-8 |
| Work task: CT3 part of Core Network Impacts for A-Interface User Plane over IP | AoIP-CN | Rel-8 |
| Work task: CT3 aspects - Stage 3 for ICSRA | ICSRA | Rel-8 |
| Building Block: Stage 3 CIMS_3GPP2 | REDOC_3GPP2 | Rel-8 |
| Building Block: CT3 part of Stage 3 for MESSIW | MESSIW | Rel-8 |
| Work task: Deleted - CT3 part of Stage 3 for Network Improvements for Machine-Type Communications | NIMTC-CN | Rel-10 |
| Work task: CT3 part of Stage 3 for IP Flow Mobility and seamless WLAN offload | IFOM-CT | Rel-10 |
| Work task: CT3 part of CN aspects of Enabling Coder Selection and Rate Adaptation for UTRAN and E-UTRAN for Load Adaptive Applications | ECSRA_LAA-CN | Rel-10 |
| Work task: CT3 part on Stage 3 on enhancements for Multimedia Priority Service | eMPS-CN | Rel-10 |
| Work task: CT3 part of Stage 3 for S2b Mobility based on GTP | SMOG-St3 | Rel-10 |
| Feature or Study Item: Dynamic view of SIP message for Inter-IMS Network to Network Interface (II-NNI) (Stage 3) | NNI_DV | Rel-10 |
| Work task: CAT solution for voice and video call in CS domain | CAT-SS | Rel-8 |
| Work task: Deleted - CT3 aspects of SAES | SAES | Rel-8 |
| Building Block: SAE for LTE access | SAES-LTE | Rel-8 |
| Feature or Study Item: IMS Multimedia Telephony and Supplementary Services | IMSTSS | Rel-8 |
| Building Block: General aspects of IMS Sup Services | IMSSS-Gal | Rel-8 |
| Building Block: CT aspects of Multi Access PDN Connectivity | MAPCON-St3 | Rel-10 |
| Feature or Study Item: Policy Enhancements for Sponsored Connectivity and Coherent Access to Policy related Databases | PEST | Rel-10 |
| Feature or Study Item: PCRF failure and restoration | PCRF_FR | Rel-10 |
| Building Block: CT3 aspects of Policy Enhancements for Sponsored Connectivity and Coherent Access to Policy related Databases | PEST-CT3 | Rel-10 |
| Building Block: CT3 part of PCRF failure and restoration | PCRF_FR | Rel-10 |
| Building Block: High level and common (for all accesses) functions | EPS-ComF | Rel-8 |
| Work task: Unified guidelines for Diameter usage within 3GPP | SAES-DIAM | Rel-8 |
| Building Block: Deleted - Stage 3 for PRIOR | PRIOR-EMR | Rel-8 |
| Feature or Study Item: IMS Centralized Service control | ICSRA | Rel-8 |
| Feature or Study Item: IMS Enhancements for support of Packet Cable access | PktCbl | Rel-8 |
| Building Block: IMS Inter-working aspects in Support of Cable Regulatory requirements | PktCbl-Intw | Rel-8 |
| Work task: CT1,CT3 aspects of PktCbl-Interwork | PktCbl-Intw | Rel-8 |
| Work task: CT3 part of PCRF based solution | PCSCF_RES | Rel-12 |
| Building Block: CT3 part of Support of ALT-C attribute | ALTC | Rel-12 |
| Feature or Study Item: Customized Alerting Tone (CAT) service | CAT | Rel-8 |
| Feature or Study Item: Service-Level Interworking for Messaging Services | MESSIW | Rel-8 |
| Building Block: System enhancements for interconnection interfaces between two IMSs | IMS_NNI | Rel-8 |
| Building Block: Stage 3 of MW-IMS | MIW-IMS-St3C3 | Rel-8 |
| Feature or Study Item: WLAN Interworking – Private Network access from WLAN 3GPP IP Access | WLANPNA | Rel-7 |
| Feature or Study Item: System enhancements for Fixed Broadband access to IMS | FBI | Rel-7 |
| Feature or Study Item: Evolution of Policy Control and Charging | PCC | Rel-7 |
| Work task: PCC-Rx CT3 aspects | PCC-Rx-c3 | Rel-7 |
| Work task: Deleted - CT3 PS domain aspects to support IMS Emergency sessions | EMC1 | Rel-7 |
| Feature or Study Item: Interworking between the 3GPP CS domain with BICC or ISUP as signalling protocol and external SIP-I networks | ExtSIPI | Rel-7 |
| Feature or Study Item: MBMS Enhancements | MBMSE | Rel-7 |
| Feature or Study Item: CS-IBCF and CS-TrGW definition in 3GPP specifications | CS-IBCF | Rel-9 |
| Feature or Study Item: MBMS support in EPS | MBMS_EPS | Rel-9 |
| Feature or Study Item: Study on Bandwidth Saving at Nb Interface with IP transport | BSNbIP | Rel-7 |
| Feature or Study Item: Study on Support of (G)MSC-S - (G)MSC-S Nc Interface based on the SIP-I protocol | NcSIP | Rel-7 |
| Building Block: MBMS Mz interface | MBMSMz | Rel-7 |
| Feature or Study Item: PDU multiplexing at Nb Interface with IP transport | NbIPMux | Rel-7 |
| Building Block: Maintenance of TISPAN R1 | MAINT_R1 | Rel-7 |
| Building Block: IMS CAT Supplementary Service | CAT-SS | Rel-8 |
| Building Block: Issues for CT3 TR 29.804 | SAES | Rel-8 |
| Work task: Stage 3 CIMS_3GPP2 (CT3) | REDOC_3GPP2 | Rel-8 |
| Feature or Study Item: 3GPP2 Input to Common IMS | CIMS_3GPP2 | Rel-8 |
| Feature or Study Item: Maintenance of TISPAN documentation | MAINTISP | Rel-8 |
| Work task: Documentation of TISPAN R1 and R2 in CT3 | REDOC_TIS-C3 | Rel-8 |
| Feature or Study Item: Support for IMS Emergency Calls over GPRS and EPS | IMS_EMER_GPRS_EPS | Rel-9 |
| Work task: CT aspects of SRVCC support for IMS Emergency Calls | IMS_EMER_GPRS_EPS-SRVCC | Rel-9 |
| Work task: CT3 aspects of SRVCC support for IMS Emergency Calls | IMS_EMER_GPRS_EPS-SRVCC | Rel-9 |
| Building Block: CN aspects of IMS Media Plane Security | MEDIASEC_CORE | Rel-9 |
| Work task: CT3 aspects of IMS Media Plane Security | MEDIASEC_CORE | Rel-9 |
| Building Block: CT3 aspects of Completion of IMS Restoration Procedures | eIMS_RP | Rel-9 |
| Building Block: CT3 part of IMS Signalling Activated Trace | ISAT | Rel-14 |
| Work task: CT3 aspects of 5G Trace management | NETSLICE-5GTRACE-CT | Rel-15 |
| Work task: CT3 aspects of EvoLP | eVoLP-CT | Rel-15 |
| Building Block: CT3 aspects of bSRVCC_MT | bSRVCC_MT | Rel-15 |
| Building Block: CT3 aspects of eSPECTRE | eSPECTRE | Rel-15 |
| Work task: CT3 aspects of MONASTERY | MONASTERY | Rel-15 |
| Building Block: CT3 aspects of PV_VBC | PC_VBC | Rel-15 |
| Building Block: Stage 3 of CAPIF | CAPIF-CT | Rel-15 |
| Work task: CT3 aspects of 5G System - Phase 1 | 5GS_Ph1-CT | Rel-15 |
| Work task: CT3 aspects of eMCVideo | eMCVideo-CT | Rel-15 |
| Work task: CT3 aspects of IMSo5G | 5GS_Ph1-IMSo5G | Rel-15 |
| Work task: CT3 aspects of EDCE5 | EDCE5-CT | Rel-15 |
| Building Block: Stage 3 of NAPS | NAPS-CT | Rel-15 |
| Building Block: Study on Policy and Charging for Volume Based Charging | FS_PC_VBC | Rel-15 |
| Work task: Study on CT3 aspects of 5G System - Phase 1 | 5GS_Ph1-CT | Rel-15 |
| Building Block: CT3 aspects of IMS Stage-3 IETF Protocol Alignment | IMSProtoc9 | Rel-15 |
| Work task: CT3 aspects of eCNAM | eCNAM-CT | Rel-15 |
| Work task: CT3 aspects of NAPS | NAPS-CT | Rel-15 |
| Work task: CT3 aspects of FS_PC_VBC | FS_PC_VBC | Rel-15 |
| Building Block: CT3 aspects of IMSProtoc16 | IMSProtoc16 | Rel-16 |
| Work task: CT3 aspects of Multi-device and multi-identity | MuD | Rel-16 |
| Work task: CT3 aspects of 5WWC | 5WWC | Rel-16 |
| Feature or Study Item: Enhancement of 5G PCC related services | en5GPccSer | Rel-16 |
| Feature or Study Item: Enhancement of 3GPP Northbound APIs | eNAPIs | Rel-16 |
| Work task: CT3 aspects of Vertical_LAN | Vertical_LAN | Rel-16 |
| Work task: CT3 aspects of 5G_CIoT | 5G_CIoT | Rel-16 |
| Work task: CT3 aspects of 5G_eLCS | 5G_eLCS | Rel-16 |
| Work task: CT3 aspects of eNA | eNA | Rel-16 |
| Work task: CT3 aspects of eNS | eNS | Rel-16 |
| Work task: CT3 aspects of ETSUN | ETSUN | Rel-16 |
| Work task: CT3 aspects of ATSSS | ATSSS | Rel-16 |
| Work task: CT3 aspects of 5G_eSBA | 5G_eSBA | Rel-16 |
| Work task: CT3 aspects of PARLOS | PARLOS | Rel-16 |
| Work task: CT3 Aspects of E2E_DELAY | E2E_DELAY | Rel-16 |
| Work task: CT3 aspect of 5G_SRVCC | 5G_SRVCC | Rel-16 |
| Building Block: CT3 aspects of SBIProtoc16 | SBIProtoc16 | Rel-16 |
| Work task: CT3 aspects of RACS | RACS | Rel-16 |
| Work task: CT3 Aspects of 5G_URLLC | 5G_URLLC | Rel-16 |
| Work task: CT3 aspects of eIMS5G_SBA | eIMS5G_SBA | Rel-16 |
| Work task: CT3 aspects of VBCLTE | VBCLTE | Rel-16 |
| Work task: CT3 aspects of xBDT | xBDT | Rel-16 |
| Work task: deleted: CT3 aspects of MONASTERY2 | MONASTERY2 | Rel-16 |
| Work task: CT3 aspects of V2XAPP | V2XAPP | Rel-16 |
| Work task: CT3 aspects of eV2XARC | eV2XARC | Rel-16 |
| Building Block: CT aspects of MC_XMB | MC_XMB-CT | Rel-16 |
| Building Block: CT aspects of eCAPIF | eCAPIF | Rel-16 |
| Work task: CT3 aspects of SEAL | SEAL | Rel-16 |
| Building Block: Deleted: C3 aspects of LOLC (TBD) | LOLC | Rel-16 |
| Building Block: CT3 aspects of eNAPIs | eNAPIs | Rel-16 |
| Building Block: CT3 aspects of NB-IoT/eMTC Non-Terrestrial Networks in EPS | IoT_SAT_ARCH_EPS | Rel-17 |
| Work task: CT3 aspects of RDSSI | RDSSI | Rel-17 |
| Building Block: CT3 aspects of ReP_UDR | ReP_UDR | Rel-17 |
| Feature or Study Item: Packet Flow Description (PFD) management enhancement | pfdManEnh | Rel-17 |
| Building Block: Stage 3 (CT3) of EVEX | EVEX | Rel-17 |
| Building Block: CT3 aspects of NR_redcap | ARCH_NR_REDCAP | Rel-17 |
| Building Block: Stage 3 CT3 for eCryptPr | eCryptPr | Rel-17 |
| Building Block: CT3 aspects of 5MBS | 5MBS | Rel-17 |
| Building Block: CT3 Aspects of Application Layer Support for Uncrewed Aerial Systems (UAS) | UASAPP | Rel-17 |
| Building Block: Deleted- CT3 aspects of eV2XARC_Ph2 | eV2XARC_Ph2 | Rel-17 |
| Building Block: CT3 aspects of eSEAL | eSEAL | Rel-17 |
| Building Block: CT3 aspects of NBI17 | NBI17 | Rel-17 |
| Building Block: CT3 aspects of BEPoP | BEPoP | Rel-17 |
| Work task: CT3 aspects of 5GC architecture for satellite networks | 5GSAT_ARCH-CT | Rel-17 |
| Work task: CT3 aspects of TEI17_SE_RPS | TEI17_SE_RPS | Rel-17 |
| Work task: CT3 aspects for enabling MSGin5G Service | 5GMARCH | Rel-17 |
| Work task: CT3 aspects of N7 Interfaces Enhancements to Support GERAN and UTRAN | TEI17_NIESGU | Rel-17 |
| Work task: CT3 aspects for EDGEAPP | EDGEAPP | Rel-17 |
| Building Block: CT3 aspects of IMS Stage-3 IETF Protocol Alignment | IMSProtoc17 | Rel-17 |
| Building Block: CT3 aspects of FS_eIMS5G2 | FS_eIMS5G2 | Rel-17 |
| Feature or Study Item: Enhancement of 5G PCC related services in Rel-17 | en5GPccSer17 | Rel-17 |
| Work task: CT3 aspects of AKMA | AKMA-CT | Rel-17 |
| Work task: CT3 aspects of eNS_Ph2 | eNS_Ph2 | Rel-17 |
| Work task: CT3 aspects on TEI17_SPSFAS | TEI17_SPSFAS | Rel-17 |
| Work task: CT3 aspects of 5G eEDGE | eEDGE_5GC | Rel-17 |
| Work task: CT3 aspects of 5G_eLCS_ph2 | 5G_eLCS_ph2 | Rel-17 |
| Work task: CT3 aspects of ATSSS_Ph2 | ATSSS_Ph2 | Rel-17 |
| Work task: CT3 aspects of support of enhanced Industrial IoT | IIoT | Rel-17 |
| Work task: CT3 aspects of eNPN | eNPN | Rel-17 |
| Work task: CT3 aspects for ID_UAS | ID_UAS | Rel-17 |
| Work task: CT3 aspects of 5G_ProSe | 5G_ProSe | Rel-17 |
| Work task: CT3 aspects of eV2XAPP | eV2XAPP | Rel-17 |
| Work task: CT3 aspects on TEI17_SAPES | TEI17_SAPES | Rel-17 |
| Work task: CT3 aspects on TEI17_DCAMP | TEI17_DCAMP | Rel-17 |
| Work task: CT3 aspects on TEI17_GEM | TEI17_GEM | Rel-17 |
| Work task: CT3 aspects of eNA_Ph2 | eNA_Ph2 | Rel-17 |
| Work task: CT3 aspects of MPS2 | MPS2 | Rel-17 |
| Building Block: CT3 aspects of SBIProtoc17 | SBIProtoc17 | Rel-17 |
| Building Block: CT3 aspects of PAP/CHAP protocols usage in 5GS | PAP_CHAP | Rel-17 |
| Building Block: CT3 aspects of IVAS_Codec | IVAS_Codec | Rel-18 |
| Building Block: CT3 aspects of NSCALE | NSCALE | Rel-18 |
| Building Block: CT3 aspects of SNAAPP | SNAAPP | Rel-18 |
| Building Block: CT3 aspects on TEI18_SLAMUP | TEI18_SLAMUP | Rel-18 |
| Building Block: CT3 aspects of 5GSAT_Ph2 | 5GSAT_Ph2 | Rel-18 |
| Building Block: CT3 aspects of PIN | PIN | Rel-18 |
| Building Block: CT3 aspects of PINAPP | PINAPP | Rel-18 |
| Building Block: CT3 aspects of UAS Ph2 | UAS_Ph2 | Rel-18 |
| Building Block: CT3 aspects of Ranging_SL | Ranging_SL | Rel-18 |
| Building Block: CT3 aspects of 5GFLS | 5GFLS | Rel-18 |
| Building Block: CT aspects of GMEC | GMEC | Rel-18 |
| Building Block: CT aspects of AIML | AIMLsys | Rel-18 |
| Building Block: CT3 aspects for 5MBS_Ph2 | 5MBS_Ph2 | Rel-18 |
| Building Block: CT3 aspects of Network Slicing Phase 3 | eNS_Ph3 | Rel-18 |
| Building Block: CT3 aspects of NG_RTC | NG_RTC | Rel-18 |
| Building Block: CT3 aspects of ATSSS_Ph3 | ATSSS_Ph3 | Rel-18 |
| Building Block: CT3 aspects of UPF enhancement for exposure and SBA | UPEAS | Rel-18 |
| Building Block: CT aspects of 5G AM Policy | AMP | Rel-18 |
| Building Block: CT3 aspects of ADAES | ADAES | Rel-18 |
| Building Block: CT3 aspects of 5GMARCH_Ph2 | 5GMARCH_Ph2 | Rel-18 |
| Building Block: CT3 aspects of VMR | VMR | Rel-18 |
| Building Block: CT aspects of eNA_Ph3 | eNA_Ph3 | Rel-18 |
| Building Block: CT3 aspects of NBI18 | NBI18 | Rel-18 |
| Building Block: CT3 aspects of SBIProtoc18 | SBIProtoc18 | Rel-18 |
| Building Block: CT3 aspects of UEP18 | UEP18 | Rel-18 |
| Building Block: CT3 aspects of IMSProtoc18 | IMSProtoc18 | Rel-18 |
| Building Block: CT3 aspects of 5G AM Policy | AMP | Rel-18 |
| Building Block: CT3 aspects of AIML | AIMLsys | Rel-18 |
| Building Block: CT3 aspects of GMEC | GMEC | Rel-18 |
| Building Block: CT3 aspects on Dynamically Changing AM Policies in the 5GC Phase 2 | TEI18_DCAMP_Ph2 | Rel-18 |
| Building Block: CT3 aspects of XRM | XRM | Rel-18 |
| Building Block: CT3 aspects of eNA_Ph3 | eNA_Ph3 | Rel-18 |
| Building Block: CT3 aspects of TEI18_ADEE | TEI18_ADEE | Rel-18 |
| Building Block: CT aspects of TEI18_IPv6PD | TEI18_IPv6PD | Rel-18 |
| Building Block: CT aspects of 5GSATB | 5GSATB | Rel-18 |
| Building Block: CT aspects of TRS_URLLC | TRS_URLLC | Rel-18 |
| Building Block: CT aspects of Detnet | DetNet | Rel-18 |
| Building Block: CT aspects of EDGEAPP_Ph2 | EDGEAPP_Ph2 | Rel-18 |
| Feature or Study Item: Rel-18 enhancements of session management policy control | SMPC18 | Rel-18 |
| Building Block: CT aspects of SFC | SFC | Rel-18 |
| Feature or Study Item: Enhancement of Network Automation Enablers | eNetAE | Rel-18 |
| Building Block: CT3 aspects of 5GSATB | 5GSATB | Rel-18 |
| Building Block: CT3 aspects of UASAPP_Ph2 | UASAPP_Ph2 | Rel-18 |
| Building Block: CT3 aspects of 5G_eLCS_Ph3 | 5G_eLCS_Ph3 | Rel-18 |
| Building Block: CT3 aspects of 5G_ProSe_Ph2 | 5G_ProSe_Ph2 | Rel-18 |
| Building Block: CT3 aspects of SEAL_Ph3 | SEAL_Ph3 | Rel-18 |
| Building Block: CT3 aspects of SEALDD | SEALDD | Rel-18 |
| Building Block: CT3 aspects of V2XAPP_Ph3 | V2XAPP_Ph3 | Rel-18 |
| Building Block: CT3 aspects of EDGEAPP_Ph2 | EDGEAPP_Ph2 | Rel-18 |
| Building Block: CT3 aspects of EDGE_Ph2 | EDGE_Ph2 | Rel-18 |
| Building Block: CT3 aspects of eNPN_Ph2 | eNPN_Ph2 | Rel-18 |
| Building Block: CT3 aspects of eUEPO | eUEPO | Rel-18 |
| Building Block: CT3 aspects of 5WWC_Ph2 | 5WWC_Ph2 | Rel-18 |
| Building Block: CT3 aspects of eNSAC | eNSAC | Rel-18 |
| Building Block: CT3 aspects of Seamless UE context recovery | SUECR | Rel-18 |
| Building Block: CT3 aspects of SFC | SFC | Rel-18 |
| Building Block: CT3 aspects of Detnet | DetNet | Rel-18 |
| Building Block: CT3 aspects of TEI18_IPv6PD | TEI18_IPv6PD | Rel-18 |
| Building Block: CT3 aspects of TEI18_SDNAEPC | TEI18_SDNAEPC | Rel-18 |
| Building Block: CT3 aspects of TRS_URLLC | TRS_URLLC | Rel-18 |
| Building Block: CT3 aspects of MCProtoc18 | MCProtoc18 | Rel-18 |
| Building Block: CT3 aspects of Service Based Interface Protocol Improvements Release 19 | SBIProtoc19 | Rel-19 |
| Work task: CT3 Aspects on Minimize the Number of Policy Associations | TEI19_MINPA | Rel-19 |
| Work task: CT3 aspects of Providing per-subscriber VLAN instructions from UDM and DN-AAA | TEI19_VLANSUB | Rel-19 |
| Work task: CT3 aspects of Enhancing Parameter Provisioning with static UE IP address and UP security policy | TEI19_IP_SP_EXP | Rel-19 |
| Work task: CT3 aspects for Enabling Edge Applications Phase 3 | EDGEAPP_Ph3 | Rel-19 |
| Building Block: CT3 aspects of Rel-19 Enhancements of 3GPP Northbound and Application Layer Interfaces and APIs | NBI19 | Rel-19 |
| Building Block: CT3 aspects of IMS Stage-3 IETF Protocol Alignment | IMSProtoc19 | Rel-19 |
| Building Block: CT3 aspects of Protocol enhancements for Mission Critical Services | MCProtoc19 | Rel-19 |
| Work task: CT3 Aspects of Application Layer Support for Uncrewed Aerial Systems (UAS), Phase 3 | UASAPP_Ph3 | Rel-19 |
| Building Block: CT aspects of Providing per-subscriber VLAN instructions from UDM and DN-AAA | TEI19_VLANSUB | Rel-19 |
| Building Block: CT aspects of Enhancing Parameter Provisioning with static UE IP address and UP security policy | TEI19_IP_SP_EXP | Rel-19 |
| Building Block: CT aspects for Enabling Edge Applications Phase 3 | EDGEAPP_Ph3 | Rel-19 |
| Work task: CT3 aspects of integration of satellite components in the 5G architecture Phase 3 | 5GSAT_Ph3_ARCH | Rel-19 |
| Work task: CT3 aspects of Application enablement for AI/ML services | AIML_App | Rel-19 |
| Work task: CT3 aspects of Core Network Enhanced Support for Artificial Intelligence (AI)/Machine Learning (ML) | AIML_CN | Rel-19 |
| Work task: CT3 aspects of Enhancement of support for Edge Computing in 5G Core network - Phase 3 | eEDGE_5GC_Ph3 | Rel-19 |
| Work task: CT3 aspects of Enhanced application layer support for location services | eLSAPP | Rel-19 |
| Work task: CT3 aspects of Multi-Access (ATSSS_Ph4) | MASSS | Rel-19 |
| Work task: CT3 aspects of Application enablement for mobile metaverse services | Metaverse_App | Rel-19 |
| Work task: CT3 aspects of MPS for IMS Messaging and SMS services | MPS4msg | Rel-19 |
| Work task: CT3 aspects of System architecture for Next Generation Real time Communication services Phase 2 | NG_RTC_Ph2 | Rel-19 |
| Work task: CT3 aspects of SEAL DD (Data Delivery) Phase 2 | SEALDD_Ph2 | Rel-19 |
| Work task: CT3 aspects of QoS monitoring enhancement | TEI19_QME | Rel-19 |
| Work task: CT3 aspects of Architecture support of roaming value-added services | TEI19_RVAS | Rel-19 |
| Work task: CT3 aspects of Spending Limits for UE Policies in Roaming scenario | TEI19_SLUPiR | Rel-19 |
| Work task: CT3 aspects of UAS, UAV and UAM Phase 3 | UAS_Ph3 | Rel-19 |
| Work task: CT3 aspects of Identifying non-3GPP Devices Connecting behind a UE or 5G-RG | UIA_ARC | Rel-19 |
| Work task: CT3 aspects of UPF enhancement for Exposure And SBA Phase 2 | UPEAS_Ph2 | Rel-19 |
| Feature or Study Item: Rel-19 Enhancements of Network Automation Enablers | eNetAE19 | Rel-19 |
| Building Block: CT aspects of Spending Limits for UE Policies in Roaming scenario | TEI19_SLUPiR | Rel-19 |
| Building Block: CT aspects of QoS monitoring enhancement | TEI19_QME | Rel-19 |
| Building Block: CT aspects of UAS, UAV and UAM Phase 3 | UAS_Ph3 | Rel-19 |
| Building Block: CT aspects of Core Network Enhanced Support for Artificial Intelligence (AI)/Machine Learning (ML) | AIML_CN | Rel-19 |
| Building Block: CT aspects of Enhanced application layer support for location services | eLSAPP | Rel-19 |
| Work task: CT3 aspects of Proximity-based Services in 5GS Phase 3 | 5G_ProSe_Ph3 | Rel-19 |
