Ribbon's Cell-Site Router Solution to Enable Bharti Airtel's Pan-Indian 5G Deployment

Enables a full suite of Layer 3 IP Services at the 5G Mobile Edge

PLANO,Texas,Dec. 22,2022 -- 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,today announced that Bharti Airtel ("Airtel"),India's leading telecommunications services provider,has selected Ribbon to expand its current IP Transport backhaul network in order to deploy 5G throughout India.

Ribbon's 5G Cell Site Router (CSR) solution,designed for optimized delivery and efficiency,leverages the Ribbon Muse domain orchestration platform deployed in Airtel's network for automation and analytics. The CSR is based on the Neptune 1022R IP router – a flexible high capacity platform that provides support for multiple access technologies and services in a compact form factor.

"We've been working very closely with Airtel in order to design a solution to meet their exact,wide-ranging specifications on cost efficiency,delivery,and technical capability," said Sam Bucci,Executive Vice President & General Manager of Ribbon's IP Optical Networks Business Unit. "5G will prove to be a critical enabler for India's continued growth and we're proud to partner with Airtel,a proven leader in this space,on this key initiative."

This agreement builds on the previously announceddeployment of Neptune and Muse within Airtel's network for 5G readiness.

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.comMedia Contact

Catherine Berthier

+1 (646) 741-1974

cberthier@rbbn.com