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What is NDNC / DND?

The National Do Not Call (NDNC) registry - also known as the Do Not Disturb (DND) registry - is maintained by TRAI. Subscribers on this list have opted out of receiving unsolicited commercial calls. Calling a registered subscriber without valid prior consent is a violation of TRAI’s TCCCPR Regulations, 2025, and results in a UCC (Unsolicited Commercial Communication) complaint against your account.
NDNC and UCC are two sides of the same framework. NDNC is the registry (who has opted out); UCC is the complaint mechanism (what happens when you call them anyway).

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Number series and NDNC scope

NDNC compliance applies to all outbound commercial calls on Indian number series:
Number series matter. Using the wrong series is itself a violation. Complaints arising from calls made via incorrect number types are treated as UCC regardless of consent documentation.
OTP delivery and service alerts with documented prior consent are classified as transactional and face lower restrictions, but consent records are still required.

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How Vobiz enforces NDNC

Vobiz integrates NDNC scrubbing into the outbound call path for Indian numbers:
  1. Checks numbers against the NDNC registry before allowing promotional or transactional calls on regulated series
  2. Blocks calls to registered DND numbers that lack documented consent
  3. Logs blocked attempts for compliance review

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Staying compliant - proactive steps

1

Scrub your contact list before campaigns

Remove any numbers on the NDNC registry that lack documented consent before you start dialling.
2

Maintain consent records

For each number you call, keep a record of the consent date, the channel used, and the consent text shown to the subscriber. Consent must be no older than 6 months.
3

Honour opt-out requests immediately

When a subscriber asks to stop receiving calls, remove them from your active list instantly and do not redial. Calling after an opt-out is a UCC violation regardless of prior consent.
4

Use the correct number series

Promotional calls must use the 140 series. Transactional and service calls use 160. Using a standard mobile number for commercial outreach is itself a violation.

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UCC notifications

If Vobiz receives a UCC complaint traced to a number on your account, you will be notified on this timeline: All UCC notifications are sent from ndnc@vobiz.ai to the designated compliance contacts on your account.
Not receiving an email notification does not exempt you from compliance obligations. Keep your contact details updated in the Vobiz Console.

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Action required within 24 hours

Proof must cover the last 6 months and include:
  • Business Logo to verify identity on DLT
  • Date of Consent within last 6 months
  • Complainant Phone Number exactly as reported

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2. Remove the complainant

Remove the complainant’s number from your calling list immediately. Continuing to call someone who has filed a UCC complaint is a major violation, even if you hold valid consent.

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Consequences & enforcement

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TRAI blacklisting

If blacklisted by TRAI, the following actions are taken across all operators in India (not just Vobiz):
  • Immediate disconnection of all telecom resources (PRI/SIP Trunks)
  • Blacklisted on the national DLT platform for 1 year
  • Prohibited from obtaining any new telecom services in India
  • Possible blocking of devices used for making UCC calls

India Calling Regulations

Regulatory requirements and compliance setup.

India Number KYC

Verify your identity to start renting Indian numbers.