Nokia Siemens Networks has reportedly made an offer for key assets from Nortel's wireless division, while Avaya and Siemens have bid for Nortel's enterprise unit.
NSN has also made an offer for the Canadian firm's wireless research unit, and is particularly interested in its LTE technology, people familiar with the matter told the Wall Street Journal.
The acquisition would help increase NSN's footprint in the lucrative US wireless market.
While the enterprise unit was put on auction, NSN's bid for the wireless assets was unsolicited, the sources said. All the bids relatively low offers, they added.
Nortel, Nokia Siemens and Avaya have declined to comment publicly.