Specification
3GPP TS 24.294: IP Multimedia Subsystem (IMS) Centralized Services (ICS) protocol via I1 interface
At a glance
- Title
- IP Multimedia Subsystem (IMS) Centralized Services (ICS) protocol via I1 interface
- Newest version
- V19.0.0 (Rel-19)
- Versions indexed
- 5
- Newest per release
- Rel-15: V15.0.0 (2018-06-21); Rel-16: V16.0.0 (2020-07-09); Rel-17: V17.0.0 (2022-04-05); Rel-18: V18.0.0 (2024-04-05); Rel-19: V19.0.0 (2024-09-26)
In plain words
TS 24.294 says: "describes the I1 interface between IMS Centralized Services (ICS) UE and Service Centralization and Continuity (SCC) Application Server (AS).". It defines a new application layer protocol over I1 for interaction, including session control procedures and supplementary services control procedures. In V19.0.0, the protocol runs over Unstructured Supplementary Service Data (USSD) transport, but is not restricted to USSD transport.
Source: 3GPP TS 24.294 V19.0.0, clause 1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: https://www.3gpp.org/ftp/Specs/archive/24_series/24.294/24294-j00.zip
Newest version in each release
| Release | Newest version | In the archive | TSG meeting |
|---|---|---|---|
| Rel-19 | V19.0.0 | 2024-09-26 | TSG CT #105 |
| Rel-18 | V18.0.0 | 2024-04-05 | TSG SA #103 |
| Rel-17 | V17.0.0 | 2022-04-05 | not recorded |
| Rel-16 | V16.0.0 | 2020-07-09 | not recorded |
| Rel-15 | V15.0.0 | 2018-06-21 | not recorded |
Source: 3GPP specification archive, versions indexed by 3GPP Scout. Each version links its official file.
Meetings behind the latest versions
Plenary meetings:
- TSG CT #105 approved V19.0.0 (Rel-19)
- TSG SA #103 is recorded for V18.0.0 (Rel-18)
Source: 3GPP CR database and specification archive, as indexed by 3GPP Scout.
Sources
- 3GPP TS 24.294 V19.0.0, clause 1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: https://www.3gpp.org/ftp/Specs/archive/24_series/24.294/24294-j00.zip
- 3GPP TS 24.294 V19.0.0, clause 4.1. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: https://www.3gpp.org/ftp/Specs/archive/24_series/24.294/24294-j00.zip
How this page was made
The facts box and the tables come straight from the 3GPP specification archive and CR database as indexed by 3GPP Scout. An AI model (GPT-6 Luna) wrote the paragraph and named the source of each sentence. Code checked every quote word for word against the stored source text and every number against the cited source. A second AI model from another company (Claude Opus 5.5) reviewed the paragraph against the same sources. The 3GPP documents themselves govern.