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).
Number series and NDNC scope
NDNC compliance applies to all outbound commercial calls on Indian number series:| Number series | Type | NDNC applies |
|---|---|---|
140xxxxx | Promotional / transactional voice | Yes |
160xxxxx | Service / informational voice | Yes |
| Standard 10-digit mobile/landline | Direct calls | Yes |
1800xxxxx | Toll-free inbound | Inbound only - N/A |
OTP delivery and service alerts with documented prior consent are classified as transactional and face lower restrictions, but consent records are still required.
How Vobiz enforces NDNC
Vobiz integrates NDNC scrubbing into the outbound call path for Indian numbers:- Checks numbers against the NDNC registry before allowing promotional or transactional calls on regulated series
- Blocks calls to registered DND numbers that lack documented consent
- Logs blocked attempts for compliance review
Staying compliant - proactive steps
Scrub your contact list before campaigns
Remove any numbers on the NDNC registry that lack documented consent before you start dialling.
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.
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.
UCC notifications
If Vobiz receives a UCC complaint traced to a number on your account, you will be notified on this timeline:| Time | Stage | Trigger |
|---|---|---|
| 0 Hours | Initial Notification | Vobiz receives and validates UCC complaint |
| 6 Hours | Reminder | No valid proof submitted yet |
| 12 Hours | Final Reminder | Last chance before compliance action |
| 24 Hours | Compliance Action | Proof deadline expired - compliance ID blocked |
ndnc@vobiz.ai to the designated compliance contacts on your account.
Action required within 24 hours
1. Submit consent proof
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
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.Consequences & enforcement
| Scenario | Trigger | Consequence |
|---|---|---|
| Single Complaint | No proof submitted in 24 hours | Compliance ID blocked |
| First Violation | 5+ unique complaints within 10 days | Compliance ID suspended for 15 days |
| Second Violation | Repeated 5+ complaints after 1st violation | TRAI Blacklisting (1 Year) |
TRAI blacklisting
Related
India Calling Regulations
Regulatory requirements and compliance setup.
India Number KYC
Verify your identity to start renting Indian numbers.