Telecom regulator TRAI on Saturday announced a three-step process to implement National Do Not Call Registry which will check unsolicited calls after 45 days of registration with the telecom service provider.

In the first phase of implementation the National Informatic Centre has designed an online registration module for telemarketers. As of now about 14,750 telemarketers having around 4,50,000 telephone lines have already applied with various telecom service providers for getting themselves registered with the Department of Telecom.

The telecom service providers are in the process to verify these telemarketers.

In the second phase, the registration of subscribers for NDNC would commence. The registration is being done through their respective service providers, TRAI said in a statement.

"Once a telephone number is registered, it will take about 45 days for this mechanism to come into effect," TRAI said adding in the third phase, NIC has prepared a scrubbing module and the authority is in a process of validating it.

Once the module is functional, the authority will ask all telemarketers to get their calling list scrubbed through this module and telemarketers would be able to call only those numbers which are cleared by NDNC registry, it added.