The company aims to dismiss 400 workers. It is launching consultative negotiations on staff reductions which concern almost all of its personnel in Finland.
NSN employs 6,250 people in Espoo, Oulu and Tampere.
The maker of mobile network equipment has already undergone consultative negotiations earlier this year. The company cut 600 jobs on the basis of talks concluded in March.
Union boss warns of "hidden dangers"
The head of YTN, the Federation of Professional and Managerial Staff, has expressed shock at the latest cuts at NSN.
YTN president Pertti Porokari said that once again a skilled, professional staff would have to pay for the mistakes made by a company.
He warned employees and shop stewards to carefully consider whether the 'golden handshakes' on offer make sense. Porokari said that while the payoffs may sound good, they may have hidden dangers.