What is DLT in Bulk SMS?
Complete Guide on DLT Guidelines & Template Categories
DLT in Bulk SMS refers to Distributed Ledger Technology, a blockchain-based system implemented to regulate and secure SMS communications in industries like banking, e-commerce, and telecommunications. It is primarily used to prevent spam, ensure compliance with government regulations, and enhance transparency in SMS communication.
Answer: In Bulk SMS, DLT (Distributed Ledger Technology) is a mandatory blockchain-governed registry enforced by the Telecom Regulatory Authority of India (TRAI) under TCCCPR 2018. It mandates that every enterprise sending commercial SMS in India must register as a Principal Entity (PE), approve 6-character sender headers, and register message templates across 4 regulated categories (Promotional, Service Implicit, Service Explicit, and Transactional).
- ✓ Cryptographic Scrubbing: Messages without registered PE, Header, and Template IDs are instantly blocked by telecom firewalls.
- ✓ Multi-Portal Sync: Registration on any one telecom DLT portal (Jio, Airtel, VI, BSNL) syncs cryptographically across all Indian operators.
SMSINDIAHUB provides complimentary end-to-end DLT onboarding from our Bhopal, Madhya Pradesh HQ, facilitating instant approval and telemarketer binding nationwide.
How to Setup & Master DLT Registration in India
Watch our comprehensive video walkthrough on registering your business, binding telemarketer IDs, and approving message templates.
▶ What You Will Learn
- ✓ Principal Entity (PE) registration process across telecom portals (Jio, Airtel, Vi, BSNL).
- ✓ How to bind SMSINDIAHUB Telemarketer (TM) ID to your entity chain.
- ✓ Submitting 6-character Headers (Sender IDs) for instant approval.
-
✓
Formatting dynamic variables
{#var#}inside content templates.
What is DLT in Bulk SMS? >> Complete Guide on DLT:
The official 4 types of DLT templates, their specific business purposes, real-world examples, DND delivery rules, and Sender ID formats.
| Type of DLT Templates | Purpose | Example | DND Number | Time Restrictions | Sender ID |
|---|---|---|---|---|---|
|
Promotional SMS
|
Promotional bulk sms is used for sending offers, discount and Marketing sms to new or existing clients. For marketing, offers, and sales engagement. | Sales promotions and special offers. |
Not allowed
Consent Required
|
10 a.m. to 9 p.m. |
Six characters numeric, starting with a numeral for the business category (e.g. 123456).
|
|
Service Implicit SMS
|
To send informational sms that are not marketing in nature. | Service notifications not covered by service explicit category (e.g. order dispatch, payment receipts). | Allowed | None (24x7) |
Six characters alphabetic (e.g. SMSHUB).
|
|
Service Explicit SMS
|
To offer updates on services to existing customers. Messages designed to promote or sell products/services to existing customers with prior consent. | Messages designed to promote or sell products/services to existing registered users. |
Not allowed
Consent Required
|
None |
Six characters alphabetic (e.g. SMSHUB).
|
|
Transactional SMS
|
To convey critical information triggered by the customer's interaction. | Any order confirmations, OTPs for transactions (Banking and financial entities). | Allowed | None, can be sent 24x7 |
Six characters alphabetic, reflecting the brand (e.g. HDFCBK).
|
DLT Content Templates Explained
In India, the DLT platform categorizes message content into four distinct types, each with specific guidelines to ensure compliance and effective communication.
Transactional Route
Purpose: To convey critical information triggered by the customer's interaction. Exclusively reserved for banking institutions, credit card providers, and certified financial entities.
"Dear Customer, your OTP for transaction of Rs.{#var#} at {#var#} is {#var#}. Do not share this OTP with anyone. - {#var#}"
Service Implicit Route
Purpose: To send informational SMS that are not marketing in nature. Arises organically from a user transaction or existing commercial engagement.
"Hello {#var#}, your order #{#var#} has been dispatched and will arrive by {#var#}. Track here: {#var#} - SMSINDIAHUB"
Service Explicit Route
Purpose: To offer updates on services to existing customers. Messages designed to promote or sell products/services to users with prior relationship.
"Dear {#var#}, upgrade your existing cloud plan today and get an extra 20% credits free. Use code {#var#}. Valid till {#var#}. - SMSHUB"
Promotional Route
Purpose: For marketing, offers, and sales engagement. Sent to prospective clients and customers to drive purchases and event signups.
"Mega Festive Sale! Get flat 50% discount on all purchases today. Use coupon {#var#} at checkout: {#var#}. T&C apply."
How DLT Scrubbing Works in Real Time
Every SMS dispatched through SMSINDIAHUB undergoes millisecond-level verification against distributed blockchain nodes across all Indian telecom operators.
Entity Verification
The platform authenticates your registered Principal Entity (PE) ID against the unified telecom blockchain to ensure your business identity is verified by KYC.
Header Matching
The 6-character Sender ID (Header) is verified in milliseconds to confirm it is allocated exclusively to your entity and matches the message category.
Template Scrubbing
The message text is checked against the approved Content Template ID. Variable slots {#var#} are parsed and validated in real time.
Carrier Delivery
Once scrubbed, the telecom network routes the message with sub-5-second speed to the subscriber handset and delivers instant handset delivery receipts (DLR).
How to Complete Your DLT Registration
Follow these 4 simple steps to become 100% compliant and activate your bulk messaging gateway with SMSINDIAHUB.
Entity Registration
Register your business as an Enterprise / Principal Entity on any telecom DLT portal (Jio, Airtel, Vi, BSNL). Blockchain synchronizes across all operators automatically.
Bind Telemarketer (TM)
Add SMSINDIAHUB as your registered Telemarketer using our official TM ID in your DLT portal. This authorizes our gateway to deliver your scrubbed SMS traffic.
Header Approval
Apply for your unique 6-character Sender ID (Header) representing your organization or brand name (e.g. SMSHUB). Approvals typically take 1 to 24 hours.
Template Approval
Draft and submit your content templates under the correct category (Transactional, Service, or Promotional) with dynamic variables {#var#}. Once approved, start sending!
Frequently Asked Questions About DLT
Get clear answers to common questions regarding DLT guidelines, template approvals, and regulatory compliance.
What is DLT in Bulk SMS and why was it implemented?
Do I need to register on all telecom DLT portals separately?
What are dynamic variables {#var#} in DLT templates?
{#var#} allow you to insert personalized information into an approved template, such as an OTP code, customer name, order number, amount, or tracking URL. The static text of your message must match the approved template exactly, while the variable contents change for each recipient.
Can I send promotional SMS to DND numbers?
How does SMSINDIAHUB assist with DLT template approvals?
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