| LS | Title | From | To | Approval date |
| SG5-LS185 | LS/r on approval of new terms and definitions (reply to SG9-LS105) | SG5 | SG9; | 2020-10-23 |
| SG9-LS105 | LS/r on approval of new terms and definitions (SCV-LS26) [to SCV/CCV, all ITU-T Study Groups] | SG9 | SCV; SG2; SG3; SG5; SG11; SG12; SG13; SG15; SG16; SG17; SG20; | 2020-04-23 |
| SG20-LS139 | LS/r on approval of new terms and definitions (SCV-LS26) | SG20 | SCV; | 2019-12-06 |
| SG11-LS117 | LS/r on approval of new terms and definitions (SCV-LS26) | SG11 | SCV; | 2019-10-25 |
| SG13-LS140 | LS/r on approval of new terms and definitions (reply to SCV-LS26) | SG13 | SCV; | 2019-10-25 |
| SG5-LS123 | LS/r on approval of new terms and definitions (SCV-LS26) | SG5 | SCV; | 2019-09-20 |
| SCV-LS26 | LS/o on approval of new terms and definitions | SCV | SG2; SG3; SG5; SG9; SG11; SG12; SG13; SG15; SG16; SG17; SG20; ITU-D SG 2; ITU-D SG 1; | 2019-06-17 |
