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Header Guidelines On DLT

As Per New Guidelines From TRAI, Every Individual/Enterprise Has To Register On Dlt Platform If They Want To Use Bulk Sms/Voice Services then every header needs to be approved and registered with the Telecom Operators.

Header Guidelines On DLT


Distributed Ledger Technology(Dlt) Is A Blockchain-based Registration System. This System Keeps Track Of All The Records Of Promotional & Transitional Messages Sent By The Senders Where All The Telemarketers And Entities/Enterprises Have To Be Registered With Operators And All The Customers And Retailers Are Connected To The Operators Through Telemarketers.

As Per New Guidelines From Trai, Every Individual/Enterprise Has To Register On  Dlt Platform If They Want To Use Bulk Sms/Voice Services For Their Business Purposes, Trai Has Made Dlt Mandatory For Everyone From 1 June 2020. It Means For All Your Senders/Headers & Sms Templates You Need To Register As An Entity To The Dlt Blockchain Platform. If Senders Are Not Active On Dlt Platform Message Will Not Be Delivered.


Here, we explain the different type of Headers with examples:


Headers that can be used for sending Promotional messages fall under PROMOTIONAL type. Promotional message means commercial communication that can be sent to a mobile subscriber whose preferences are not set (not on DND). Or, any commercial communication that an enterprise can send to an intended recipient after taking consent to send such messages.

Header (6 numeric): 565690, 787878, 987123, 555555, etc.

Promotional Headers should start with the number that matches with the category (as per DND Preferences).

1. Banking/Insurance/Financial products/ credit cards.
Ex: 123890, 154987

2. Real Estate
Ex: 234567, 264789

3. Education
Ex: 397134, 321456

4. Health
Ex: 467931, 444654

5. Consumer goods and automobiles
Ex: 582974, 564123

6. Communication/Broadcasting / Entertainment/IT
Ex: 631469, 693147

7. Tourism and Leisure
Ex: 789456, 714369

8. Food and Beverages
Ex: 896321, 816934

0 (Zero) Others – Category that doesn’t appear in 1-8
Ex: 012389, 098654


Headers that can be used for sending Transactional, Service Implicit and Service Explicit messages fall under OTHER types. The same Header can be used against all three types of messages. All These Headers are Case Sensitive.


1.Header (6-alpha): TRUBLQ, TRUblq, TRubLQ, trublq, KLMNOP, DLTdlt, etc.
Transactional: Message which contains One Time Password (OTP) and requires to complete a banking transaction initiated by the bank customer. This is applicable to all banks including national/ scheduled/ private/ Govt. and MNC banks. Ex: TRHDFC, DCBmsg, MkotaK


2.Service Implicit: Messages arising out of customer’s actions or his relationship with the Sender, that is not promotional, and is not in the interest of the customer to block such communications. These messages may or may not be triggered by a subscriber-initiated transaction and will not be blocked for subscribers who have otherwise blocked service messages also.

  • Confirmation messages of net banking or a credit/debit transaction.
  • Product purchase confirmation.
  • Delivery status of a parcel.
  • OTP required for e-commerce websites, app login, social media apps, KYC, etc.
  • Messages from schools regarding attendance/transport.
  • Messages from hospitals/clinics regarding appointment/discharge reports.
  • Govt./TRAI/DoT mandated messages, advisories, messages from state Govt., LEAs, local authorities, traffic advisories, election commission, disaster management advisories.
  • Service messages from car workshops, gadget service centers.
  • Day-end/ month-end settlement alerts to securities/Demat account holders.
    Ex: ABCDE, AFioma, uniFco.


3.Service Explicit: Any service message which doesn’t fall under the category of service message (Implicit) will be sent only against service explicit, digitally verified/verifiable consent that has been taken from the subscriber by the respective enterprise.

Ex:  NUTUKI, PRizem, semRTA


4.OTHER – Govt. : Only Govt. entities can register these Headers that can be used for sending Transactional, Service Implicit and Service Explicit messages.

Header (3 to 9 numeric and should start with 1): 1444, 19898, 15555, 19090909, etc.


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