| LS | Title | From | To | Approval date |
| SG16-LS47 | LS/r on security contacts list of ITU-T SG17 lead Study Group on security (SG17-LS5) [to ITU-T SG17] | SG16 | SG17; | 2017-10-27 |
| SG20-LS56 | LS/r on Security Contacts List of ITU-T SG17 lead Study Group on security (reply to ITU-T SG17 LS5) | SG20 | SG17; | 2017-09-15 |
| SG13-LS29 | LS/r on Security Contacts List of ITU-T SG17 lead Study Group on security (reply to SG17-LS005) | SG13 | SG17; | 2017-07-14 |
| SG15-LS62 | LS/r to ITU-T SG17 on ITU-T SG15 updated Security Contact (reply to SG17-LS5) | SG15 | SG17; | 2017-06-30 |
| SG9-LS24 | LS/r on Security Contacts List of ITU-T SG17 lead Study Group on security (SG17-LS 5) [to ITU-T SG17] | SG9 | SG17; | 2017-05-31 |
| SG5-LS20 | LS/r on Security Contacts List of ITU-T SG17 lead Study Group on security (reply to SG17 - LS 5 -E) | SG5 | SG17; | 2017-05-24 |
| SG3-LS19 | LS/r on Security Contacts List of ITU-T SG17 lead Study Group on security | SG3 | SG17; | 2017-04-13 |
| SG2-LS11 | LS/r on Security Contacts List of ITU-T SG17 lead Study Group on security [response to SG17 - LS5] | SG2 | SG17; | 2017-04-07 |
| SG17-LS5 | LS on Security Contacts List of ITU-T SG17 lead Study Group on security | SG17 | ITU-R SG 5; ITU-R SG 4; ITU-D SG 2; SG2; SG3; SG5; SG9; SG11; SG12; SG13; SG15; SG16; TSAG; SG20; | 2017-03-30 |
