X0206 3 2023-02-22 0 0001708055 Ribbon Communications Inc. RBBN 0001967463 Redington Dan 6500 CHASE OAKS BOULEVARD SUITE 100 PLANO TX 75023 0 1 0 0 EVP of Global Sales Restricted Stock Units (RSUs) 0 Common Stock 133928 D RSUs 0 Common Stock 125000 D The RSUs were awarded on December 15, 2022 and vest in full on the first anniversary of the date of grant. The RSUs were awarded on December 15, 2022 and vest as to one-third on the first anniversary of the date of grant, and the remaining two-thirds will vest in four equal semi-annual installments thereafter through December 15, 2025. Patrick Macken, By POA from Dan Redington, EVP of Global Sales 2023-03-01