NCPR

It is the register behind the DND facility: it holds which subscribers have blocked promotional calls and SMS, and for which categories. Businesses that send commercial communication must check their lists against it before calling.

How it came about

The register has been renamed as the rules changed. TRAI’s 2007 regulations set up a National Do Not Call (NDNC) registry. The 2010 regulations replaced it with the NCPR, where customers registered to stop promotional messages. Under TCCCPR 2018 (PDF), opens in a new tab, preferences are kept on distributed ledgers run by the telecom operators (the “DL-Preference” in the regulation), and the NCPR data was migrated onto them. TRAI’s consumer pages still call it the NCPR, and most people still call it the DND list.

How it works

A subscriber records a preference through 1909, a USSD code, an approved app or an OTP-verified web portal. The operator writes it to the preference ledger, which is shared across operators through DLT.

Before a campaign, the sender’s list of target numbers is compared with the preference and consent ledgers. The regulation calls this scrubbing: it checks “whether commercial communication(s) can be sent to the Recipient as per his registered preference(s) or as per consent”. Scrubbing is done by registered telemarketers through the DLT platform, which is why it needs a business’s DLT registration and access.

Why it matters for voice agents and sales teams

Calling a number that has blocked real estate promotions, from a real estate campaign and without consent recorded under the regulations, is unsolicited commercial communication under TCCCPR. Since the 2025 amendment (PDF), opens in a new tab, five complaints against a sender in ten days trigger action, and repeat violations can end in disconnection of every number and trunk the sender holds, across operators, for a year.

An AI voice agent does not change this. The scrub has to happen upstream, on the list, through the business’s own DLT access. BlackWolf, for example, checks its own suppression list (opt-outs heard on calls, complaints and numbers the client adds) before every dial, but it does not scrub against the NCPR, which needs the client’s DLT access.

Example

A Hyderabad developer exports 3 BHK enquiries from a property portal and wants to run a promotional calling campaign. Its registered telemarketer uploads the list on the DLT platform, numbers whose preferences block real estate promotions are removed unless the developer holds consent recorded under the regulations, and only the scrubbed list goes to the dialler.

Common confusions

• NCPR vs DND. DND is the facility and the everyday name. The NCPR is the register that holds the preferences.
• NCPR vs a suppression list. A suppression list is one business’s own record of people who asked it to stop, plus complaints. The NCPR is national and covers all senders in a category. A compliant campaign needs both.
• NCPR vs NDNC. NDNC was the name of the 2007 registry. It is the same idea under an older name.
• Scrubbing once. Preferences can change at any time, and the regulation gives a change effect within 24 hours, so a list scrubbed last month is not a scrubbed list today.

This entry is a summary as of September 2026, not legal advice.