ITU Operational Bulletin
Messages complement to ITU-T Recommendation
ITU-T Recommendation K.21
K.21
Last approved: 31.X.2011
Referenced in 8 issues of the Bulletin.
2022
1 amendmentDate / Message
2019
1 amendmentDate / Message
Messages complement to ITU-T Recommendation
Last approved: 31.X.2011
Referenced in 8 issues of the Bulletin.