ITU Operational Bulletin
Messages complement to ITU-T Recommendation
ITU-T Recommendation H.643.1
H.643.1
Last approved: 1.V.2019
Referenced in 1 issue of the Bulletin.
2019
1 amendmentDate / Message
Messages complement to ITU-T Recommendation
Last approved: 1.V.2019
Referenced in 1 issue of the Bulletin.