RBBN - Ribbon Communications Inc. (RBBN) Q3 2021 Earnings Call Transcript October, 28 2021 03:01 AM Ribbon Communications Inc. Image source: The Motley Fool. Ribbon Communications Inc. (NASDAQ: RBBN) Q3 2021 Earnings Call Oct 27, 2021 , 4:30 p.m. ET Operator Continue reading For further details see: Ribbon Communications Inc. (RBBN) Q3 2021 Earnings Call Transcript