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| Spec | WG | Title | Releases |
|---|---|---|---|
| TR 22.823 | S1 | Study on enhancements to IMS for new real time communication services | 16.1.0 |
| TS 23.228 | S2 | IP Multimedia Subsystem (IMS); Stage 2 | 17.0.0 16.6.0 15.4.0 14.6.0 13.8.0 12.10.0 11.11.0 10.9.0 9.4.0 8.12.0 7.16.0 6.16.0 |
| TS 23.406 | S2 | TISPAN; IP Multimedia Subsystem (IMS); Stage 2 description [3GPP TS 23.228 v7.2.0, modified] | 7.2.0 |
| TS 23.506 | S2 | TISPAN; IP Multimedia Subsystem (IMS); Stage 2 description [3GPP TS 23.228 Release 7, modified] | 8.1.0 |