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ribbon Revenue grew 10 % sequentially to $ 211 million for the second quarter of 2021 , Net income increased to $ 23 million and Adjusted EBITDA grew 119 % sequentially to $ 43 million July 28 , 2021 Conference Call Details Conference call to discuss the Company's financial results for the second quarter ended June 30 , 2021 on July 28 , 2021 , via the investor section of its website at http://investors.ribboncommunications.com , where a replay will also be available shortly following the conference call . Conference Call Details : Date : July 28 , 2021 Time : 4:30 p.m. ( ET ) Dial - in number ( Domestic ) : 877-407 2991 Dial - in number ( Intl ) : 201-389-0925 Instant Telephone Access : Call me ™ Replay information : A telephone playback of the call will be available following the conference call until August 11 , 2021 and can be accessed by calling 877-660-6853 or 201-612-7415 for international callers . The reservation number for the replay is 137200791 . Investor Relations Tom Berry +1 ( 978 ) 614-8050 tom.berry@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 Ribbon Communications Inc. Reports Second Quarter 2021 Financial Results Analyst Relations Michael Cooper +1 ( 708 ) 212-6922 mcooper@rbbn.com Plano , TX - Ribbon Communications Inc. ( Nasdaq : RBBN ) , a global provider of real - time communications software and IP optical transport solutions to service providers , enterprises , and critical infrastructure sectors , today announced its financial results for the second quarter of 2021 . Sales for the first half of 2021 were up 10 % versus the first half of 2020 , while Adjusted EBITDA increased 60 % and Non - GAAP diluted earnings per share increased 133 % over the same time period . Revenue for the second quarter of 2021 was $ 211 million , compared to $ 210 million for the second quarter of 2020 . " In the first half of the year , we made significant strides on the execution of our strategy , with new major IP Optical wins with Rogers , Optus , Singtel and several others , " noted Bruce McClelland , President and Chief Executive Officer of Ribbon Communications . " These customer wins will significantly broaden our presence in this large addressable market and strengthen our foundation , establishing a clear path to growth in 2022 and beyond . " Mr. McClelland added , " Sales in India in the quarter were impacted by the surge in Covid infections and country - wide restrictions . Deployments have partially recovered in recent weeks , but timing of a full recovery in network investment is difficult to predict , so it is important for us to be prudent with our expectations for the remainder of the year . " Financial Highlights 1,2 The following table summarizes the consolidated financial highlights for the three months ended June 30 , 2021 and 2020 ( in millions , except per share amounts ) . GAAP Revenue GAAP Net income ( loss ) Non - GAAP Net income GAAP Diluted earnings ( loss ) per share Weighted average shares outstanding for GAAP diluted earnings ( loss ) per share Non - GAAP diluted earnings per share Weighted average shares outstanding for Non - GAAP diluted earnings per share Non - GAAP Adjusted EBITDA $ $ $ $ $ $ Three months ended June 30 , 2021 211 $ 23 $ 27 $ 0.15 $ 154 0.17 $ 154 43 $ 2020 210 ( 8 ) 11 ( 0.06 ) 144 0.08 151 30 Cash , cash equivalents and restricted cash was $ 115 million at June 30 , 2021 , compared with $ 109 million at March 31 , 2021 and $ 94 million at June 30 , 2020 . GAAP Net income of $ 23 million in the second quarter of 2021 includes a $ 12 million non - cash gain associated with the quarterly mark - to - market of the Company's investment in American Virtual Cloud Technologies , Inc. ( " AVCT " ) from the sale of the 1