TS 23.172 – Service Change and UDI Fallback (SCUDIF)
3GPP TS 23.172 is the 3GPP Technical Specification for Service Change and UDI Fallback (SCUDIF). Its official 3GPP title is “Technical realization of Circuit Switched (CS)”. It is published in 17 releases (Rel-2 to Rel-19); the latest version is 19.0.0 in Rel-19.
Enables fallback from multimedia to speech during call setup and service change between speech and multimedia during an active call.
Releases and versions of TS 23.172
| Release | Latest version | Links |
|---|---|---|
| Rel-19 | 19.0.0 | Read · Download (3GPP) |
| Rel-18 | 18.0.0 | Read · Download (3GPP) |
| Rel-17 | 17.0.0 | Read · Download (3GPP) |
| Rel-16 | 16.0.0 | Read · Download (3GPP) |
| Rel-15 | 15.0.0 | Read · Download (3GPP) |
| Rel-14 | 14.0.0 | Read · Download (3GPP) |
| Rel-13 | 13.0.0 | Read · Download (3GPP) |
| Rel-12 | 12.0.0 | Read · Download (3GPP) |
| Rel-11 | 11.0.0 | Read · Download (3GPP) |
| Rel-10 | 10.0.1 | Read · Download (3GPP) |
| Rel-9 | 9.0.0 | Read · Download (3GPP) |
| Rel-8 | 8.0.0 | Read · Download (3GPP) |
| Rel-7 | 7.0.0 | Read · Download (3GPP) |
| Rel-6 | 6.4.0 | Read · Download (3GPP) |
| Rel-5 | 5.6.0 | Read · Download (3GPP) |
| R99 | 1100 | Read · Download (3GPP) |
| Rel-2 | 1200 | Read · Download (3GPP) |
Scope of TS 23.172
Category: Services (Call Control). Technology generation: 3G. Network layer: CoreNetwork.
Who should read this specification?
- Network operators
- Device manufacturers
Implementation notes
Complexity level: Intermediate. Implementation difficulty: Medium.
Key technologies
Specifications referenced by TS 23.172
- TS 23.018 Basic call handling in 3GPP CS domain
- TS 23.003 Numbering, Addressing and Identification
- TS 29.232 Mc Interface Protocol Profile
- TS 26.102 Mapping of AMR and other codecs to interfaces
- TS 23.078 CAMEL Phase 4 Stage 2 Specification
- TS 23.082 Call Forwarding Supplementary Services Stage 2
- TS 22.078 CAMEL Phase 4 Stage 1 Specification
- TS 25.413 Radio Access Network Application Part (RANAP)
- TR 21.905 3GPP Terminology and Definitions
- TS 23.153 Out-of-Band Transcoder Control Stage 2
- TS 24.008 NAS Call, Mobility and Session Procedures
- TS 26.103 3GPP Codec Lists for OoBTC and TrFO
Specifications that reference TS 23.172
- TS 24.008 NAS Call, Mobility and Session Procedures
- TS 26.114 IMS Multimedia Telephony Client
- TS 29.002 Mobile Application Part (MAP) Specification
- TS 25.413 Radio Access Network Application Part (RANAP)
- TS 32.298 Charging Data Record Specification
- TS 23.078 CAMEL Phase 4 Stage 2 Specification
- TS 23.292 IMS Centralized Services (ICS) Architecture
- TS 29.007 PLMN-PSTN/ISDN Interworking Requirements
- TS 23.153 Out-of-Band Transcoder Control Stage 2
- TS 23.205 Bearer Independent CS Core Network Stage 2
- TS 23.009 Handover Procedures in PLMNs
- TS 23.018 Basic call handling in 3GPP CS domain
Other specifications in the 23 series
- TS 23.153 Out-of-Band Transcoder Control Stage 2
- TS 23.161 Network-based IP Flow Mobility (NBIFOM)
- TS 23.167 IMS Emergency Services
- TS 23.171 Location Services Stage 2 Specification
- TS 23.179 MCPTT Functional Architecture
- TS 23.180 Mission Critical Services in IOPS Mode
- TS 23.195 Provision of UE Specific Behaviour Information
- TS 23.198 Open Service Access (OSA) Stage 2
Related glossary terms
Related topics
Frequently asked questions
What is 3GPP TS 23.172?
3GPP TS 23.172 is the 3GPP Technical Specification for Service Change and UDI Fallback (SCUDIF). Enables fallback from multimedia to speech during call setup and service change between speech and multimedia during an active call.
Which 3GPP releases include TS 23.172?
TS 23.172 is published in 17 releases, from Rel-2 to Rel-19. The latest version on 3GPP Explorer is 19.0.0 (Rel-19).
What category does TS 23.172 belong to?
TS 23.172 belongs to the Services (Call Control) category of 3GPP specifications. It applies to 3G networks.
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