Unified communications is still a young, emerging industry. In its short lifespan the number of players has quickly grown. One of the biggest companies in unified communications has been Nortel. The Canadian network hardware giant had a solid relationship with Microsoft and visions of grandeur of taking on Avaya and Cisco.
After filing for bankruptcy protection though, Nortel is apparently taking a look in the mirror and trying to return to a simpler time with a more aggressive focus on their core business- networking. So, they sold their wireless communications infrastructure business to Nokia-Siemens. Now they are apparently considering selling off their unified communications division with Avaya and Siemens-Enterasys being suggested as the leading contenders.