NO DND

The National Customer Preference Register (NCPR), formerly the National Do Not Call Registry (NDNC),is intended to give Indian consumers an opportunity to limit the telemarketing calls they receive. The Telecom Regulatory Authority of India (TRAI) has issued "The Telecom Commercial Communications Customer Preference Regulations (TCCCPR) 2010" on 1st December 2010.
As per the regulations laid down by TRAI no unsolicited telecom commercial communication is allowed to the mobile subscribers registered with DND.

Using this app you can exclude the NDNC registered subscribers while calling.