| LS | Title | From | To | Approval date |
| SG12 - LS 23 | LSOR on new Recommendation P.MOS to ITU-R WP6C, ITU-T SG9, SG16 and VQEG (ITU-R WP6C LS 30, COM 9 – LS 26) | SG12 | VQEG; ITU-R WP 6C; SG9; SG16; | 2013-03-28 |
| COM 9 - LS 26 | Reply LS to ITU-T SG12 on Interpretation of MOS | SG9 | SG12; | 2013-01-18 |
| ITU-R WP 6C - LS 30 | Liaison statement to ITU-T Study Group 12 on Interpretation of MOS
| ITU-R WP 6C | SG12; | 2012-11-08 |
| COM 12 - LS 170 | Interpretation of MOS | SG12 | SG9; SG16; ATIS IIF; VQEG; ITU-R WP 6C; | 2012-06-07 |