In connection with the preparation for the 2022 annual meeting of stockholders of Ribbon Communications Inc., on March 30, 2022, Krish A. Prabhu, a member of the Company's Board of Directors, determined that he does not intend to stand for re-election as a director of the Company when his term expires at the Annual Meeting. Mr. Prabhu will remain a member of the Board and of the committees of the Board on which he currently serves through the Annual Meeting.