📢 TRAI Mandates SMS Header Suffixes: New Rules Effective May 6, 2025
Starting May 6, 2025, the Telecom Regulatory Authority of India (TRAI) will enforce a new rule requiring all SMS headers (Sender IDs) to carry a suffix code that clearly indicates the type of message—Promotional (-P), Transactional (-T), Service (-S), or Government (-G). This move aims to enhance transparency and help recipients instantly identify the nature of incoming SMS.
🔍 What’s Changing?
- Mandatory Suffix Codes for all A2P (Application-to-Person) SMS.
- Suffixes will be appended automatically by telecom operators based on DLT-registered templates.
- Message types now include:
- -P for Promotional
- -T for Transactional
- -S for Service
- -G for Government alerts
🏢 Impact on Businesses
- No manual changes required—operators will handle suffix insertion.
- Businesses must ensure accurate template registration on the DLT platform.
- Misclassification risks can affect delivery and customer trust.
✅ Benefits for Consumers
- Instant clarity on message type.
- Easier to spot spam or promotional content.
- Improved trust in critical alerts like OTPs and government notifications.
📊 Suffix Code Reference
| Suffix | Message Type | Examples |
|---|---|---|
-P |
Promotional SMS | Offers, discounts, sales |
-T |
Transactional SMS | OTPs, payment confirmations |
-S |
Service SMS | Reminders, updates, service alerts |
-G |
Government Alerts | Public advisories, official notices |
📝 Final Note
TRAI’s suffix mandate is a consumer-first reform that simplifies SMS classification. While telecom operators will manage suffix tagging, businesses must audit their SMS templates and ensure DLT compliance before May 6, 2025.