Executive Summary & Key Takeaways (TL;DR)

If your business sends Bulk SMS, OTPs, or automated voice calls to Indian numbers, TRAI (Telecom Regulatory Authority of India) mandates that you register your business on a DLT (Distributed Ledger Technology) platform. The process involves three mandatory phases: Entity Registration, Header (Sender ID) Registration, and Content Template Registration. Failure to comply means your messages will be blocked by telecom operators.

Sending SMS in India is highly regulated to protect consumers from spam and fraud. To ensure your marketing campaigns and critical alerts (like OTPs) actually reach your customers in 2026, you must complete your DLT registration. Here is exactly how to do it.

What is DLT Registration?

DLT (Distributed Ledger Technology) is a blockchain-based registration system created by TRAI. It serves as a central database that telecom operators (like Jio, Airtel, Vi, and BSNL) use to verify the identity of the business sending an SMS and the exact content of the message.

If your business and message templates are not registered on this blockchain, telecom operators will actively scrub (block) your messages before they reach the customer's phone.

Mandatory Documents Checklist

Before you begin the registration process on any operator portal, keep these documents ready in digital format (Max file size: 5MB):

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Proof of Identity (PAN Card): The company’s PAN card (or individual PAN for sole proprietors).
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Proof of Address: GST Certificate, Certificate of Incorporation, or Shop Act License.
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Letter of Authorization (LOA): A signed document on company letterhead authorizing an individual to register on behalf of the company.
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Authorized Signatory ID: The Aadhaar card or driving license of the person mentioned in the LOA.

Choosing the Right SMS Header (Sender ID)

A Header (previously known as a Sender ID) is the 6-character code that appears at the top of the SMS on the user's phone. TRAI categorizes these into two distinct types:

SMS Category	Header Format	Example	Primary Use Case
Promotional	6 Numeric Digits	123456	Marketing, sales offers, discount codes
Transactional / Service	6 Alphabets	SMSHUB	OTPs, order confirmations, banking alerts

Step-by-Step DLT Registration Process

Complete Entity Registration

Go to a telecom operator's DLT portal (such as Jio TrueConnect or Airtel DLT). Select "Enterprise/Principal Entity" and fill in your business details. Upload your PAN, GST, and Authorization Letter. You will have to pay a one-time registration fee (approx ₹5900) directly to the operator.

Wait for Entity Approval: Wait 48-72 hours

The telecom operator will review your documents. Once approved, you will receive a unique Entity ID (PE ID) via email.

Register Your Headers (Sender IDs)

Log back into the DLT portal and navigate to the "Header" section. Request the 6-character alphabetic or numeric headers you want to use. These must strictly match your registered business name or brand name.

Register Your Content Templates

Once your headers are approved, go to the "Templates" section. Submit the exact text of the SMS you plan to send. Use the {#var#} tag for dynamic content (like OTPs, names, or tracking URLs).

Link DLT with SMSIndiaHub: Crucial final step

Once your templates are approved and you receive a Template ID, add your Entity ID, Header, and Template ID into your SMSIndiaHub dashboard. You are now ready to send compliant messages with 99.99% delivery rates.

Common Reasons for DLT Rejection

To avoid weeks of delays, double-check your application for these common pitfalls:

Header doesn't match Brand Name: If your company is "Tech Solutions Pvt Ltd" but you request the header BURGER, the operator will reject it unless you can provide a trademark proving you own that brand name.
Too many variables: Using consecutive variables like {#var#}{#var#} in a template is strictly prohibited. You must have static text separating them.
Invalid LOA format: The Letter of Authorization must exactly match the format provided by the telecom operator.

Skip the Hassle with SMSIndiaHub

Navigating DLT compliance, dealing with operator portals, and formatting templates correctly can be a massive headache for businesses just trying to communicate with their customers.

As a leading Enterprise Bulk SMS & Communication Gateway, SMSIndiaHub provides full DLT Registration & Template Approval Support. We guide you through the portal setup, ensure your headers are approved instantly, and provide the high-speed API to start delivering your messages in under 5 minutes.

Zero-Delay DLT Setup