Ribbon Appoints Steve McCaffery as Executive Vice President, EMEA and APAC Sales

WESTFORD,Mass.,Jan. 12,2021 --Ribbon Communications Inc. (Nasdaq: RBBN),a global provider of real time communications software and network solutions to service providers,enterprises,and critical infrastructure sectors,today announced that Steve McCaffery has joined the company as Executive Vice President of Sales for the EMEA (Europe,Middle East and Africa) and APAC (Asia Pacific) regions. He reports directly to Ribbon's Chief Executive Officer and President,Bruce McClelland.

"With his track record of growing revenues in EMEA and APAC,and significant experience as a trusted advisor to many of the world's largest carriers and enterprises,Steve will play a pivotal role in helping us execute on our growth plans," said Mr. McClelland. "I look forward to working together and having Steve join my leadership team."

Mr. McCaffery has more than 30 years' experience leading sales and marketing teams and working with global fixed and mobile operators.Before joining Ribbon,he was the CEO of consulting business GOT2,advising technology companies in the convergence,wireless,broadband and video spaces. Previously,McCaffery managed a $2.4B international business addressing both carrier and enterprise customers and was a member of the executive team at ARRIS following the acquisition of Motorola Home. Prior to his time at ARRIS,he built and developed Native Networks,a venture-backed company in the data space which was purchased by Alcatel-Lucent,where he helped manage the Optical Networks business in EMEA.

"I'm thrilled to be joining Ribbon at this critical juncture," said Mr. McCaffery. "The company is positioned for success and I look forward to working with the leadership and sales teams to expand our footprint in the EMEA and APAC markets."

McCaffery succeedsFernando Valdivielso,who is leaving the company to pursue other interests. "I want to thank Fernando for his accomplishments since the Ribbon-ECI merger,including integrating the APAC and EMEA sales teams," added Mr. McClelland. "We wish him the best in his future endeavors."

About Ribbon

Ribbon Communications (Nasdaq: RBBN) delivers global communications software and packet and optical network solutions to service providers,enterprises and critical infrastructure sectors. 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 IP solutions,cloud-native offers,leading-edge software security and analytics tools,as well as 5G-ready packet and optical networking solutions acquired via our recent merger with ECI Telecom. To learn more about Ribbon 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 future growth,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 Relations

Monica Gould

+1 (212) 871-3927

IR@rbbn.com

North American Press

Dennis Watson

+1 (214) 695-2224

dwatson@rbbn.com

APAC,CALA & EMEA Press

Catherine Berthier

+1 (646) 741-1974

cberthier@rbbn.com

Analyst Relations

Michael Cooper

+1 (708) 212-6922

mcooper@rbbn.com