SMS Sender ID (Header) Registration in India: A Complete Guide to Choosing and Registering Your Header on DLT

Look at the SMS inbox on any Indian phone and you will see messages from senders such as AX-HDFCBK, JD-AMAZON or VM-SWIGGY. Those short names are sender IDs, also called headers, and they tell customers instantly who a message is from. A recognisable header builds trust and improves the chance that a message is read. A confusing or random header looks suspicious, especially at a time when SMS fraud makes people cautious.

For businesses sending SMS in India, the sender ID is not just a branding choice. It must be registered on the DLT platform under TRAI's commercial communication framework before any messages can be sent. Getting it right from the start avoids delays, rejections and confusion.

What a sender ID is

A sender ID, or header, is the short identifier that appears as the sender of a business SMS. In India, what customers see usually includes a short prefix added by the network, indicating the operator and region through which the message travelled, followed by the business's registered header. The prefix is handled automatically; the part you choose and register is the header itself.

Under the DLT system, every header must be registered by a Principal Entity, meaning the business sending the messages, and linked to that entity. Messages can only be sent from registered headers, using templates that are also registered and linked to those headers.

Types of headers

Headers are generally categorised according to the kind of messages they carry. Transactional and service headers, used for OTPs, alerts, order updates and other service communication, are typically alphabetic and represent the brand, such as a shortened form of the company name. Promotional headers, used for marketing messages, follow a different format and are usually numeric. Because the rules and formats are set by the DLT framework and operators and can be updated, confirm current requirements with your DLT operator or SMS provider before submitting.

The practical point is that businesses usually need separate headers for service and promotional traffic, and templates must be linked to a header of the matching type.

Choosing a good header

For alphabetic headers, the name should clearly relate to your business and be easy for customers to recognise. Most businesses use an abbreviation of their brand or company name within the permitted character length. For example, a business called "Green Leaf Dental Clinic" might choose a header such as GRNLEF or GLDENT, provided it is available and clearly connected to the brand.

Avoid generic words that could belong to anyone, such as OFFERS or INFO, and avoid names that imitate other brands, government bodies or banks. Headers that could mislead customers about who is sending the message are likely to be rejected, and rightly so, given the scale of SMS impersonation fraud.

How header registration works

The process typically begins with registering your business as a Principal Entity on one of the operator-run DLT platforms, providing details such as company registration documents, tax registration and authorised signatory information. Once the entity is approved, you submit header requests, specifying the header name and its category. Many operators ask for justification or supporting documents showing that the header relates to your brand, such as a trademark, a website or a letter on company letterhead explaining the abbreviation.

After approval, the header is visible across operators through the shared DLT system. You then register message templates and link them to the appropriate header. Your SMS provider is linked to your entity as a telemarketer so that it can send messages on your behalf. Most reputable providers help with each step and review submissions before they go in.

Common reasons headers get rejected

Headers are often rejected when they do not clearly match the business name, when they are generic, when they resemble another brand or a government or banking entity, when supporting documents are missing or inconsistent, or when the requested category does not fit the intended messages. Submitting several random variations in the hope that one is approved can also cause delays. A clear, well-justified request is usually approved faster.

Managing headers over time

As your business grows, you may need additional headers, for example for different brands, divisions or regions. Keep a simple internal record of every registered header, its category, its linked templates and the purpose it serves. Use headers consistently so customers learn to recognise them; switching headers frequently confuses customers and can make genuine messages look suspicious. If you rebrand, plan the transition carefully so customers are not caught off guard.

Frequently asked questions

Can I send SMS without a registered header?

No. Commercial SMS in India must be sent from a header registered on the DLT platform.

How long does header approval take?

Timelines vary by operator and the completeness of your documents, so apply well before you need to send.

Can one business have multiple headers?

Yes, businesses often register separate headers for service and promotional messages or for different brands.

Get your SMS identity right

OM Enterprises guides businesses through DLT entity registration, header selection, template approval and compliant SMS sending, so your messages are trusted and delivered. Talk to our SMS team.