 PLANO, Texas, April 14, 2021 PRNewswire -- 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 that it will report financial results for the first quarter of 2021 after the close of the market on Wednesday, April 28, 2021. Following the release, Ribbon Communications will host a conference call with the financial community at 4:30 p.m. 