RBBN - Ribbon Communications Inc. (RBBN) Q4 2020 Earnings Call Transcript February, 18 2021 12:30 AM Ribbon Communications Inc. Image source: The Motley Fool. Ribbon Communications Inc. (NASDAQ: RBBN) Q4 2020 Earnings Call Feb 17, 2021 , 4:30 p.m. ET Operator Continue reading For further details see: Ribbon Communications Inc. (RBBN) Q4 2020 Earnings Call Transcript