Integrate Zoho CRM with Nortel Phone System

Integrate Zoho CRM with Nortel Phone System

         Currently, I want integrate my system Zoho Crm with Nortel System  NORTEL PABX CS1000E  to use their features (call from web interface, call history, call reminder...). 
         Can you show me way to deloy it (solution or guild). Waiting good news from you, Thanks a lot !