In October 2007, Avaya Inc. was acquired for $8.2 billion by Sierra Holdings Corp owned by two private-equity firms, TPG Capital and Silver Lake Partners.

[14] In December 2017, Avaya requested a federal judge to reduce their commitment to the Earthquakes' stadium name agreement.

[19] On February 15, 2023 the NYSE announced that shares of Avaya no longer qualified for listing on the New York Exchange and would cease to be traded there.

[23] Through Nortel's bankruptcy proceedings, assets related to their Enterprise Voice and Data business units were auctioned.

[24][25] In 1985, Performance Engineering Corporation (later PEC Solutions) was formed to offer technology services to government customers.

[7] Avaya enterprise customers include Apple, AT&T, Dell, CVS Health, as well as government organizations.

[citation needed] In January 2021, the company disclosed it had received its 600th patent for Contact Center technologies, which was granted for AI in "chatbot socialization.