| LS | Title | From | To | Approval date |
| SG2-LS126 | LS/r on SNLP (reply to ASTAP-24/OUT-18) | SG2 | APT ASTAP; SG16; | 2016-01-29 |
| APT ASTAP-26 | LS/r on SNLP (reply to COM2-LS100) [from APT ASTAP to ITU-T SG2] | APT ASTAP | SG2; SG16; | 2015-09-12 |
| SG2-LS100 | LS/r on SNLP (reply to ASTAP-24/OUT-18) | SG2 | SG16; APT ASTAP; | 2015-04-27 |
| SG16-LS143 | LS/r on SNLP (ASTAP-24/OUT-18) [to APT ASTAP] | SG16 | SG2; APT ASTAP; | 2015-02-20 |
| ASTAP-24/OUT-18 | LS on SNLP | APT ASTAP | SG2; SG16; | 2014-08-29 |