You should try to find a suitable solution on the Nortel web site. The software you need depends on the specific model of the PBX you have. For example, a link for Nortel BCM-400 MS CRM Connector. http://www.nortel.com/prd/dpp/product/p ... z5952.html
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http://www.nortel.com/prd/dpp/product/p ... z5952.html