# DLT Registration for Bulk SMS in India: Complete 2026 Guide

*By [Prasad Hajare](https://www.avianya.com/about) · Founder & Director, Avianya AI*
*Compliance · 4 min read · Published 2026-07-05 · Updated 2026-07-24*

TRAI's Distributed Ledger Technology registration is mandatory for any commercial SMS in India — here's the entity, sender ID, and template process explained plainly.

If you've ever had a bulk SMS campaign silently fail to deliver in India with no error beyond "blocked," DLT non-compliance is almost always the cause. Here's what the registration actually requires and why operators enforce it so strictly.What DLT registration actually isDLT (Distributed Ledger Technology) is TRAI's centralised anti-spam framework under the Telecom Commercial Communications Customer Preference Regulations, 2018. Instead of trusting SMS senders to self-regulate, every entity, sender ID, and message template used for commercial SMS in India must be pre-registered and verified on a DLT operator's blockchain-backed ledger before a single message can be delivered. Registration is done through operator portals like Airtel, Jio, and Vi.Who needs to registerRegistration is mandatory for anyone sending promotional, transactional, or OTP SMS — not just large enterprises. This includes:- E-commerce stores and D2C brands sending order updates or promotions
- Banks, NBFCs, and fintechs sending OTPs or alerts
- Startups, schools, hospitals, and local businesses sending any commercial SMS
- Telemarketers and agencies sending on behalf of clients
The three things you must register- **Entity registration** — your business identity, verified against your company registration documents.
- **Sender ID (header) registration** — the 6-character alphanumeric code recipients see as the sender (e.g. "AVNYAI" instead of a random number).
- **Template registration** — the exact wording of every message you intend to send, categorised as promotional, transactional, or service/OTP.
All three must be approved before a message using them can be delivered — operators check every outbound SMS against the registered template in real time and silently block mismatches.Cost and timelineExpect a one-time cost of roughly **₹5,900 + GST**, with the full process — entity, sender ID, and template approval — typically completing in **3-7 working days**. Delays usually come from template wording mismatches, not the entity verification step.Compliance rules that trip up new senders- **Exact template match** — your live message content must match the registered template precisely, including punctuation and variable placeholders. Even minor wording changes get silently blocked.
- **DND restrictions** — promotional SMS can only be sent to numbers not registered on the National Do Not Disturb (DND) registry. OTP and transactional messages are exempt from DND restrictions.
- **Sender ID consistency** — your registered sender ID must correctly link to the verified entity; using an unregistered or mismatched header gets messages rejected at the operator level.
How this fits into your wider messaging stackDLT compliance is specific to SMS — it doesn't apply to WhatsApp Business API, which has its own separate approval process through Meta. If you're running both channels, you need DLT registration for SMS *and* Meta template approval for WhatsApp, independently. Avianya AI handles DLT-compliant SMS registration as part of its bundled [Growth and Pro plans](/#pricing), alongside WhatsApp, RCS, and Email in the same dashboard.

## Frequently asked questions

**Q: Is DLT registration mandatory for all business SMS in India?**

Yes. TRAI (Telecom Regulatory Authority of India) requires DLT registration for any business sending promotional, transactional, or OTP SMS in India — this includes enterprises, e-commerce stores, startups, and any telemarketer or reseller sending on behalf of clients.

**Q: How much does DLT registration cost and how long does it take?**

DLT registration typically costs around ₹5,900 plus GST as a one-time fee, and takes roughly 3-7 working days to complete across entity, sender ID, and template registration.

**Q: What three things do I need to register on the DLT platform?**

You must register your business entity, your sender IDs (the 6-character headers customers see, e.g. AVNYAI), and every message template you intend to send — promotional, transactional, or OTP. Operators verify all three before allowing delivery.

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Source: https://www.avianya.com/blog/dlt-registration-bulk-sms-india