High Quality Content by WIKIPEDIA articles! Nortel Networks Corporation, formerly known as Northern Telecom Limited and sometimes known simply as Nortel, was a multinational telecommunications equipment manufacturer headquartered in Mississauga, 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. The period of bankruptcy protection has been extended to December 14, 2011.