TRAI (Telecom Regulatory Authority of India) has announced an important compliance update that every business using DLT SMS platforms must follow. Starting 28 October 2025, all Service Explicit (SE) messages must be delivered strictly within the time band of 10:00 AM to 9:00 PM. Any SE message sent outside this window will be automatically rejected by the system.
What’s Changing?
As per TRAI’s latest directive, all VIL DLT platforms and other registered operators will enforce this rule to ensure compliance, transparency, and customer privacy. Messages submitted outside the permissible time window will receive DLT Error Code 651 (DND Hours).
Key Highlights:
- ⏰ Permitted Time Band: 10 AM – 9 PM only.
- 🚫 Auto-rejection: Messages outside this band will not be delivered.
- ⚙️ Error Code 651: Returned for SE messages during DND hours.
- 📅 Implementation Date: 28 October 2025.
Difference Between SE, SI, and Promotional Messages
| Feature | Service Explicit (SE) | Service Implicit (SI) | Promotional |
|---|---|---|---|
| Delivery Time | 10 AM – 9 PM | 24×7 | 10 AM – 9 PM |
| Consent | Explicit, recorded consent required. | Implied from existing relationship. | Requires opt-in or sent only to non-DND numbers. |
| Recipients | Customers who have opted in, even on DND. | All existing customers (DND irrelevant). | Blocked for DND customers. |
| Message Type | Service updates that may include promotions (with consent). | Transactional alerts like OTPs, order updates. | Marketing ads, offers, discounts. |
| Sender ID | 6-character alpha ID | 6-character alpha ID | 6-digit numeric ID |
What Are Service Explicit Messages?
Service Explicit (SE) messages are a hybrid category that include both service updates and consent-based promotions. These messages are only sent to customers who have provided explicit recorded consent through the DLT system. Examples include:
- “Your loan statement is ready. Check our new refinance offers.”
- “Your insurance policy is expiring soon. Renew now and get a bonus benefit.”
Because they can contain promotional content, TRAI restricts their delivery to business hours (10 AM to 9 PM) to protect consumer privacy and avoid late-night marketing disturbances.
How to Stay Compliant
To ensure smooth delivery of messages and avoid rejection under DLT Error 651, follow these guidelines:
- ✅ Schedule Service Explicit messages only between 10 AM and 9 PM.
- 🕐 Verify each template’s classification (SE, SI, or Promotional).
- 📁 Maintain recorded consents for audit and compliance.
- ⚖️ Regularly review TRAI updates to prevent penalties or message failures.
How TextGuru Helps You Stay Compliant
TextGuru.in automatically aligns your message scheduling with TRAI regulations. Our system intelligently filters and sends Service Explicit (SE) messages only during permitted hours — so you never have to worry about rejections or compliance issues.
- 📊 Smart DLT integration to detect message type and timing.
- 📅 Auto-scheduled delivery based on TRAI time bands.
- 💬 Real-time reporting and error code tracking (651 alerts included).
Need Help or Support?
Our DLT support team is ready to assist you with template classification, time band management, and compliance strategy.
- Helpline: 82840 47608
- Email: [email protected]
TextGuru — Speedy Messaging, Trusted Delivery.
🧠 FAQ SectionFrequently Asked Questions
1. What is the delivery time window for Service Explicit (SE) messages?
All SE messages must be delivered between 10:00 AM and 9:00 PM as per TRAI mandate effective 28 Oct 2025.
2. What happens if I send an SE message after 9 PM?
Such messages will be automatically rejected by the DLT system and return Error Code 651 (DND hours).
3. How are Service Explicit (SE) messages different from Service Implicit (SI)?
SE messages require explicit customer consent and can include promotional content. SI messages are purely service/transactional and don’t need recorded consent.
4. Can TextGuru automatically schedule SE messages within the TRAI time band?
Yes, TextGuru automatically ensures that your SE messages are sent only during the allowed time window to prevent delivery failures.