| Collective Letters | 
| 
 | Number 
 | Title | Source | Destination | Date | 
|  | [ 13 ] 
 | Virtual meeting of Study Group 20, 03 February 2022 | SG20 |  | 2021-10-27 | 
|  | [ 12 ] +Add.1
 | Virtual meeting of ITU-T Study Group 20, 11-21 October 2021 | SG20 | SG | 2021-07-07 | 
|  | [ 11 ] +Add.1
 | Virtual meeting of ITU-T Study Group 20, 17-27 May 2021 The Russian version of Collective letter 11/20 was reposted to fix a typographical error in the signature block.
 | SG20 | SG | 2021-01-12 | 
|  | [ 10 ] 
 | Virtual meeting of ITU-T Study Group 20, 16 December 2020 | SG20 | SG | 2020-09-04 | 
|  | [ 9 ] 
 | Virtual meeting of Q1/20, Q2/20, Q3/20 and Q4/20 Rapporteur meetings; 2 to 5 November 2020 and Working Party 1/20; 6 November 2020 | SG20 | SG | 2020-07-31 | 
|  | [ 8 ] +Corr.1
 | Meeting of Study Group 20; Geneva, 6-16 July 2020 | SG20 | SG | 2020-02-04 | 
|  | [ 7 ] +Add.1
 | Meeting of Study Group 20; Geneva, 25 November-6 December 2019 | SG20 | SG | 2019-05-17 | 
|  | [ 6 ] +Corr.1
 | Meeting of Study Group 20; Geneva, 9-18 April 2019 | SG20 | SG | 2019-01-28 | 
|  | [ 5 ] +Add.1
 | Meeting of Study Group 20; Wuxi, China, 3-13 December 2018 | SG20 | SG | 2018-06-29 | 
|  | [ 4 ] +Add.1
 | Meeting of Study Group 20; Cairo, Egypt, 6-16 May 2018 | SG20 | SG | 2018-02-09 | 
|  | [ 3 ] 
 | Meeting of  Q1/20, Q2/20, Q3/20 and Q4/20 Rapporteur meetings; Geneva, 15-23 January 2018 and Working Party 1/20; Geneva, 24 January 2018 | SG20 |  | 2017-09-29 | 
|  | [ 2 ] 
 | Meeting of Study Group 20; Geneva, 4-15 September 2017 | SG20 |  | 2017-06-30 | 
|  | [ 1 ] +Add.1
 | Meeting of Study Group 20; Dubai, 13-23 March 2017 | SG20 |  | 2016-12-15 | 
| Results:13 total items. 
 | 
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