Useful for diagnostics, Call Clearing Codes show exactly why a call over ISDN has been released. These codes may be turned on by the administrator by going first into System Programming, then Release reasons - Text: Simple - Cause code: Y.
Nortel Networks Corporation, first founded as Northern Telecom Limited, is a multinational telecommunications equipment manufacturer headquartered in Toronto, Ontario, Canada. They made many large and small business PBX systems and were for a long time one of the primary leaders in the telecom industry. On January 14, 2009 Nortel filed for bankruptcy protection in order to restructure its debt and financial obligations. Northern Telecom, which bankruptcy lasted until 2013 and was the largest bankruptcy case in Canadian history, was then partially acquired by Avaya.