Bharti Tele-Ventures has signed a five- year managed services agreement with Nortel to host contact centre services for more than 19.7 million subscribers to Bharti's Airtel GSM mobile, broadband and fixed-line services. Nortel will create a Network Operations Center (NOC) in New Delhi and provide network design, integration, support and maintenance services for Bharti's contact centre architecture. A 24x7 'virtual storefront' voice portal based on Nortel's interactive voice response (IVR) solution will be the cornerstone of Bharti's new contact centre operation.