DLT registration

Businesses and their telemarketers must complete it before sending commercial SMS or making commercial calls in India. DLT stands for distributed ledger technology, and the registration is how TCCCPR 2018 knows who is sending what, through whom, and with whose permission.

What DLT is

TCCCPR 2018 (PDF), opens in a new tab defines distributed ledger technology as a way to keep a “single, sequenced, standardized and cryptographically-secured record of activities” shared across many participants, where records are added only when the participants agree. Regulation 13 requires operators to adopt permissioned, private DLT networks for the rules’ checks. In practice each large operator runs its own DLT portal, and the regulation requires the ledgers to be synchronised between operators.

What gets registered

• The business. A business that sends commercial communication registers as a sender, usually called a principal entity (PE).
• Headers and templates. For SMS, the sender ID (header) and the approved wording of each message (content template) are registered.
• Consent. Consent templates, and customers’ consents themselves, are recorded on a consent ledger.
• Telemarketers. The telemarketer that sends or calls on the business’s behalf registers too, and is linked to the principal entity. The 2025 amendment (PDF), opens in a new tab limited the intermediaries between the two and added physical verification and biometric authentication at registration.
• Automated calling. Under the Third Amendment of September 2026 (PDF), opens in a new tab, once it takes effect, senders must declare application-to-person calling and its caller ID ranges to their operator, and the declaration is recorded on DLT.

The DLT system also holds customers’ preferences, known as the NCPR, and their complaints.

Why it matters for voice agents

DLT is best known for SMS, but calls depend on it too. Promotional calls must come from a 140-series number issued to a registered sender or telemarketer, and scrubbing a calling list against DND preferences happens through DLT. A business with no DLT registration cannot run a compliant calling campaign, however well its software behaves on the call.

These registrations belong to the business and its telemarketer, and no calling platform can hold them in the business’s place.

Example

A Kolkata developer launching a project registers as a principal entity on an operator’s DLT portal, with company documents and verification. Its telemarketer registers and is linked to it. The telemarketer obtains 140-series numbers for promotional calls, uploads each calling list for scrubbing, and the developer’s own SMS header and templates are approved for the follow-up messages.

Common confusions

• DLT vs NCPR. DLT is the platform. The NCPR, the preference register, is one of the ledgers kept on it. Registering on DLT does not scrub a list; scrubbing is a separate step on each campaign.
• DLT vs a government portal. There is no single government DLT website. Operators run the platforms under TRAI’s regulations.
• “DLT registered” vs compliant. Registration is necessary, not sufficient. Calls must still respect preferences, consent and the number series.

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