The acquisition rumours come 15 months after Avaya was removed from bankruptcy protection after a previous leveraged buyout, valued at $8.3 billion, to TPG Captial and Silver Lake failed to reach completion in 2016.
Anonymous sources say that the offer from the private equity firm values the company at more than $20 (£15.12) per share. Avaya shares ended $13.21 (£9.99) per share at the end of last week but stock price currently stand at £17.45 (£13.20) per share.
Shares in the company before reports of the buy out had declined over 35 per cent in six months. The vendor made $738 million (£558Mn) revenue over the three months to December 2018, a decline of 14 million year on year when it finished with $752 million (£568.6Mn) and has also seen a new management team join the company after announcing underwhelming Q1 results in February.
Avaya declined to comment on the reports.