| LS | Title | From | To | Approval date |
| COM 12 - LS 134 | Characterisation exercises (G.729.1/ G.720.1A; G.729B/ G.720.1A; G.711.1D/ G.722B) | SG12 | SG16; | 2011-11-09 |
| COM 12 - LS 145 | Response LS to ITU-T SG 16 on revision of P.56 | SG12 | SG16; | 2011-11-09 |
| COM 12 - LS 146 | Codec overload point | SG12 | SG16; TIA TR-41; | 2011-11-09 |
| COM 12 - LS 150 | Reply liaison on interpretation of MOS | SG12 | SG9; SG16; ATIS IIF; VQEG; ITU-R WP 6C; | 2011-11-09 |
| COM 12 - LS 151 | LS to SG16 on De-Jitter Buffer Modeling and Delay Variation Performance | SG12 | SG16; | 2011-11-09 |
| COM 16 - LS 238 | LS to ITU-T SG 12 on audio coding matters (on STL, G.729.1VAD, G722B/G.711.1D layered stereo, floating point of ITU-T SWB codecs, G722 time scaling – replies to COM12-LS85, 89, 98, 101, 105, 112, 113, 115, 119, 122) | SG16 | SG12; | 2011-03-25 |
| COM 12 - LS 122 | LS on G.711.1 & G.722 SWB extensions and STL | SG12 | SG16; | 2011-03-16 |
| COM 12 - LS 98 | G711-1_G722_SWB test plan | SG12 | SG16; | 2011-01-27 |
| COM 12 - LS 101 | Reply to LS to SG 12 on usage of P.OLQA for G.718-SWB/G.729.1-SWB (COM 16 - LS 193 -E) | SG12 | SG16; | 2011-01-27 |
| COM 12 - LS 105 | Consent on Draft Revised Recommendation P.56 | SG12 | SG16; | 2011-01-27 |
| COM 12 - LS 112 | Interpretation of MOS in different contexts | SG12 | SG9; SG16; ITU-R WP 6C; VQEG; | 2011-01-27 |
| COM 12 - LS 113 | Revision of Recommendation G.1050 | SG12 | SG9; SG16; | 2011-01-27 |
| COM 12 - LS 115 | QoE Aspects of Telepresence | SG12 | SG16; | 2011-01-27 |
| COM 12 - LS 119 | Jan 2011 LS to SG16 Question 10 on De-Jitter Buffer Modeling and Delay Variation Performance | SG12 | SG16; | 2011-01-27 |
| COM 12 - LS 89 | Reply LS to LS on audio coding matters | SG12 | SG16; | 2010-12-09 |
| COM 16 - LS 204 | LS to ITU-T SG 12 on QoE aspects of Telepresence | SG16 | SG12; | 2010-12-03 |
| COM 12 - LS 85 | Reply to LS from SG16 Question 10 on G.722 encoded-domain time-scaling | SG12 | SG16; | 2010-09-17 |
| COM 16 - LS 193 | LS to SG 12 on usage of P.OLQA for G.718-SWB/G.729.1-SWB | SG16 | Q9/12; Q7/12; | 2010-07-30 |
| COM 16 - LS 194 | LS to ITU-T Q17/12 on G.722 encoded-domain time-scaling | SG16 | SG12; | 2010-07-30 |