Award recognizes success in hitting key sustainability goals including meeting emissions reduction target 7 years early

PLANO,Texas,Oct. 16,2024 --Ribbon Communications Inc. (Nasdaq: RBBN),a global provider of real time communications technology and IP optical networking solutions to many of the world's largest service providers,enterprises,and critical infrastructure operators to modernize and protect their networks,announced that it has been named to Newsweek's 2025 list of America's Greenest Companies.

"This award celebrates the team's tremendous work and highlights our continued focus on sustainability," said Patrick Macken,CLO and EVP,Ribbon. "One particular point of pride is to have achieved our emissions reduction target seven years early,facilitated by a deliberate 26% cut in electricity consumption over six years and boosting our renewable electricity consumption to 10% of our total electricity use."

Ribbon's recent sustainability achievements include:

33% reduction in Scope 1+2 CO2e emissions compared to 2018,exceeding our target 7 years ahead of schedule.

17% reduction in the rate of waste sent to landfills compared to 2022

90% cumulative reduction in equipment and laboratory space compared to non-optimized operations

EcoVadis Silver Sustainability Rating in 2023 placing Ribbon in the top 16%of our peer companies in the Information and Communications Technology sector

Designed by Newsweek and Plant-A Insights Group in collaboration with GIST Impact,the list is based on research and analysis of public data of organizations both public and private in the USA that meet the minimum standards set by the European Union.

About Ribbon

Ribbon Communications (Nasdaq: RBBN) delivers communications software,IP and optical networking solutions to service providers,enterprises and critical infrastructure sectors globally. We engage deeply with our customers,helping them modernize their networks for improved competitive positioning and business outcomes in today's smart,always-on and data-hungry world. Our innovative,end-to-end solutions portfolio delivers unparalleled scale,performance,and agility,including core to edge software-centric solutions,cloud-native offers,leading-edge security and analytics tools,along with IP and optical networking solutions for 5G. We maintain a keen focus on our commitments to Environmental,Social and Governance (ESG) matters,offering an annual Sustainability Report to our stakeholders. To learn more about Ribbon,please visit rbbn.com.

Important Information Regarding Forward-Looking Statements

The information in this release contains forward-looking statements regarding future events that involve risks and uncertainties. All statements other than statements of historical facts contained in this release,including those regarding the expected benefits from use of Ribbon Communication's products,are forward-looking statements. The actual results of Ribbon Communications may differ materially from those contemplated by the forward-looking statements. For further information regarding risks and uncertainties associated with Ribbon Communications' business,please refer to the "Risk Factors" section of Ribbon Communications' most recent annual or quarterly report filed with the SEC. Any forward-looking statements represent Ribbon Communications' views only as of the date on which such statement is made and should not be relied upon as representing Ribbon Communications' views as of any subsequent date. While Ribbon Communications may elect to update forward-looking statements at some point,Ribbon Communications specifically disclaims any obligation to do so.

Investor Contact

+1 (978) 614-8050

ir@rbbn.com

Media Contact

Catherine Berthier

+1 (646) 741-1974

cberthier@rbbn.com