Nortel Networks Corporation, formerly known as Northern Telecom Limited and sometimes known simply as Nortel, is a multinational telecommunications equipment manufacturer headquartered in Toronto, Ontario, Canada. On January 14, 2009, Nortel filed for protection from creditors in the United States, Canada, and the United Kingdom, in order to restructure its debt and financial obligations.Nortel's CDMA wireless business and LTE access technology was sold to Ericsson; the Enterprise Solutions business unit, including the shares of Nortel Government Solutions and DiamondWare, was purchased by Avaya; CVAS (Carrier VoIP and Application Solutions) unit was sold to Genband; the Metro Ethernet Networks unit was sold to Ciena Corporation; Next Generation Packet Core Assets was sold to Hitachi Ltd.; and the GSM business was sold to Ericsson and Kapsch. - Source: Wikipedia