Paritel Selects Ribbon to Comply with French Government Mandate to Combat Robocalls, Fraud, & Call Spoofing

Proven STIR/SHAKEN solution leverages expertise gained through

multiple US deployments while addressing French regulatory requirements

PLANO,Texas,Sept. 20,2022 --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 Paritel,a France-based provider of telecom solutions to enterprises and small businesses,has selected Ribbon's STIR/SHAKENsolution to ensure its compliance with the "Loi Naegelen," (Naegelen Law) requiring French service providers to implement a solution protecting their customers from various types of telephony based fraud by July 2023.

"Malicious calls from bad actors are causing our customers to lose trust in the phone network," said Guillaume Rouderges,Telecom Infrastructure Manager,Paritel. "We're pleased to partner with Ribbon to help restore integrity to our customers' calling experience,in addition to meetingthe requirements of the Loi Naegelen. Having previously worked together on other projects,we're confident in Ribbon's carrier grade expertise and its ability to successfully support us in this critical undertaking."

Part of the Ribbon Call Trust® portfolio,Ribbon's STIR/SHAKEN solution is designed to fulfill the requirements for caller identity authentication,signing,verification and certificate management as defined by French law.

In addition to STIR/SHAKEN,Paritel is leveraging Ribbon's market leading core SBC for security and interworking,PSX for advanced call routing functions,and Ribbon Analyticsfor comprehensive monitoring and anomaly detection in their network.

"We have a longstanding relationship with Paritel and are pleased to have been selected for this deployment," said Ribbon's Christine Bouhiron,Head of Sales and Country Manager,France. "Our leadership and experience in identity assurance enable us to help Paritel become a market leader in adopting STIR/SHAKEN to comply with French legislation and reestablish trust in the phone experience,while continuing to secure and maintain their network."

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