Header is a unique combination of six characters representing the brand or company name of the message sender. Header was earlier known as Sender ID. In the revised TRAI DLT regulations, Sender ID is denoted by the term Header.


Header Types


TRAI categorized the header types as follows based on the purpose of the SMS. It will be asked while registering the header. Read the below article & choose the type based on your purpose.


  • Promotional

  • Others

    • Transactional

    • Service Implicit

    • Service Explicit


Promotional - These messages are related to marketing purposes and are intended for promoting a product or a service. Promotional SMS are sent to the Non DND numbers. Headers for sending Promotional SMS should be of six numeric digits and based on the business category.


Header Example for Promotional SMS - 565656, 234567


Others - The Others category comprise of Transactional, Service Implicit and Service Explicit. Headers for sending Transactional, Service Implicit and Service Explicit messages should be of six alphabetical characters. These Headers are case-sensitive.

Header Examples for Others SMS: CRMTXT, CRATXT


Transactional -  As per the latest TRAI Guidelines, only the OTP SMS sent by banks will come under the category of Transactional SMS. Transactional SMS can be used only by banks for sending One Time Password (OTP) to its clients. All banks including National / Scheduled / Government / Private and MNC Banks can send OTP to their clients from the Transactional route.



Service Implicit - Informative messages other than Banks OTP will come under this category. Important notifications such as purchase updates, order alerts, payment status, reminders, booking confirmations, OTP SMS from other sites, and other crucial updates will fall in the Service Implicit category.



Service Explicit - Sending offer/marketing SMS to your registered users will come under this category. These SMS can only be sent to the registered customers after receiving their consent.



Once the Entity is registered and you have successfully received the EntityID, you can go ahead with the registration of your senderIDs.



To know more about header registration in Jio, click here

To know more about header registration in Videocon, click here