Unify is up against a Chinese investor and non-US industrial company in the hunt for the enterprise unit according to Bloomberg, which cited three people familiar with the matter.
It said the French company had 2012 revenues of more than €764m, and could be worth up to €250m.
Lazard is reportedly advising Alcatel on the sale process, which is said to be into the second round. A final decision could be made before March.
Gores Group created Unify alongside Siemens in 2008, when it was known as Siemens Enterprise Communications.
The buyout house owns 51 per cent of the business, with Siemens holding the remaining stake.
In 2011 private equity firm Permira bought Alcatel-Lucent’s Genesys corporate call centre software unit in a $1.5bn deal.
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