Powerlink Queensland Selects Ribbon's IP Wave Solutions to Transform Operational Network

Delivers seamless transition from legacy environment to advanced IP services

PLANO,Texas,July 19,2023 --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 Powerlink,the electrical transmission grid operator in the Australian state of Queensland,has selected Ribbon to help modernize its statewide operational network. Part of Australia's National Electricity Market (NEM),Powerlink's network extends 1,700km (1,055 miles),with 15,000 km (9,300 miles) of transmission lines.

Powerlink is utilizing Ribbon's NPT family of routers to build a robust and protected internal communications network,as well as Ribbon's industry-leading LightSoft. Network Management System (NMS). Intuitive and easy to use,LightSoft provides unified multi-layer,end-to-end network management via a simple point and click interface.

"Powerlink is recognized for its ability to deliver critical infrastructure and electrical transmission services in Queensland," said Mickey Wilf,Managing Director APAC and Africa,Ribbon. "We're proud to partner with them as they migrate their operations network to an all IP environment and look forward to a close working relationship with their technical teams in the future."

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.

About Powerlink

Powerlink is a leading Australian provider of high voltage electricity transmission network services,combining innovation with insight to deliver safe,cost effective and reliable solutions.

We are a Government Owned Corporation that owns,develops,operates and maintains the high voltage electricity transmission network in Queensland. Our network extends 1,700 kilometres from Cairns to the New South Wales border.

Our purpose is to connect Queenslanders to a world-class energy future,providing electricity to five million Queenslanders and 238,000 businesses.

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

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