The NCPR aka Do Not Disturb registry is a national database containing a list of the mobile numbers of all the subscribers who have registered their preferences (by dialing or sending an SMS to 1909 or by registering using the TRAI DND mobile application) regarding receipt of unsolicited commercial communications. As per TRAI guidelines, companies are prohibited from making Unsolicited Commercial Communication to subscribers who have registered themselves in the NCPR. In short, 'Promotional Calls or SMSs' cannot be made or sent to the customers who have registered themselves in the NCPR. 

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