X0306 4 2022-10-17 0001708055 Ribbon Communications Inc. RBBN 0001945175 Mair Scott 6500 CHASE OAKS BOULEVARD STE. 100 PLANO TX 75023 1 0 0 0 Restricted Stock Units ("RSU(s)") 2022-10-17 4 A 0 40309 0 A Common Stock 40309 40309 D Each RSU represents a contingent right to receive one share of the Issuer's common stock. The RSUs shall vest in full upon the earlier of (1) the first anniversary of the date of grant and (2) the next annual stockholders meeting of the Issuer which is held at least 50 weeks after the Issuer's immediately preceding year's annual stockholders meeting subject to the Reporting Person's continued service to the Issuer through such date. /s/ Patrick Macken, Attorney-in-Fact 2022-10-19