"This number comes from an internal planning document; it describes one possible scenario, which has not yet been discussed either with representatives of the employees' council or with management," a spokesman said.
The figure was reported by Financial Times Deutschland, which revealed that Siemens is considering cutting a total of 8,500 jobs at ICN by the middle of next year.
ICN, which makes networking equipment for consumers and enterprise, carrier and public sector customers, is aiming to cut at least two billion euros(£1.3bn) from its budget, the spokesman added.
He confirmed that ICN has so far cut 7,500 jobs, including 2,000 employees transferred to Siemens' Information and Communication Mobile (ICM) division, which manufactures mobile phones and mobile communication networks.
Any job cuts "will of course be carried out as socially responsibly as possible", the spokesman added.
The ICN division has come under scrutiny since Siemens released third-quarter results highlighting the unit's poor performance. Last week, Siemens denied press reports that a further 5,000 job cuts were planned at ICN.