Quick answers<\/strong><\/p>\n In this guide<\/strong><\/p>\n DLT<\/strong> is the registration system that every business SMS in India passes through. It was set up under TRAI’s commercial communication regulations and is run by the telecom operators on a shared, blockchain-based ledger. You register who you are, which sender names you use and what your messages say, and operators check every SMS against those records before it reaches a phone. If you are completely new to this, our beginner’s guide to DLT<\/a> is a gentle place to start.<\/p>\n DLT in SMS is a registration system, required by TRAI and run by Indian telecom operators, where a business records its identity, sender IDs and message templates before it is allowed to send commercial SMS to Indian mobile numbers. Think of it as a master list that operators check for every single message. If your message is not on that list in its approved form, it does not get delivered.<\/p>\n The full form of DLT is Distributed Ledger Technology, which means the records are kept on a shared ledger maintained across telecom operators rather than in one company’s private database. Because every operator reads the same ledger, a registration done on one operator’s portal is visible to all of them. You will also hear it called the DLT platform or simply the DLT portal.<\/p>\n TRAI made DLT registration mandatory to cut down spam and fraud SMS, make every commercial sender identifiable, and give customers more control over the messages they receive. Before DLT, it was easy to send SMS with almost any sender name and any content, and very hard to trace who was behind a fraud message. Now every sender, header and template can be traced back to a registered business.<\/p>\n Yes, every commercial SMS sent to Indian numbers through an SMS provider, panel or API needs DLT registration, including OTPs, order updates, appointment reminders, bank alerts and promotional offers. There is no exemption for small volumes or small businesses. Even if you send ten messages a month, the same entity, header and template rules apply to you.<\/p>\n Any business, institution or organisation that sends SMS to customers in India needs to register on DLT as a Principal Entity, whether it is a single-owner shop, a school, a hospital, a startup app or a large company. The business whose brand appears in the message is the one that registers. Your SMS provider registers separately as a telemarketer, not in your place.<\/p>\n No, normal person-to-person SMS that you type and send from your own mobile SIM is not covered by DLT registration, because DLT applies to application-to-person (A2P) messages sent through SMS providers, panels and APIs. Using a regular SIM to blast commercial messages to many people is a different matter. It breaks telecom rules, and operators can take action on that number.<\/p>\n If you try to send business SMS without DLT registration, the operator’s system rejects the message during its checks and it never reaches the recipient’s phone. A genuine SMS provider will not even let you push unregistered traffic to operators. There is no legal shortcut here, so register first and send later.<\/p>\n DLT registration has four parts: register your business as a Principal Entity, register your headers (sender IDs), register your content templates, and bind your PE-TM chain so operators know which telemarketers carry your messages. Each step depends on the one before it. You cannot register templates without an approved header, and you cannot add a header until your entity is approved.<\/p>\n A Principal Entity, or PE, is the business or organisation that owns the SMS content and on whose behalf messages are sent, for example a clinic sending appointment reminders or a D2C brand sending order updates. When your PE registration is approved, you get an entity ID. That ID ties together all your headers, templates and telemarketer bindings.<\/p>\n A telemarketer, or TM, is the registered SMS company that technically carries your messages from your system to the telecom operators, such as your bulk SMS provider or an aggregator that it uses. The TM that finally hands traffic to the operator network is called the delivery telemarketer, or TM-D. Your PE-TM chain lists every TM involved, so the fewer hops there are, the simpler your chain.<\/p>\n Before delivery, the operator scrubs each SMS against the DLT records: it checks that the header belongs to your entity, the text matches an approved template linked to that header, the category rules for time and DND are met, and the message came through your approved PE-TM chain. If any one check fails, the SMS is blocked. This is why a single extra word in your message can stop delivery.<\/p>\n No, DLT registration applies to SMS sent over Indian telecom networks, not to WhatsApp or RCS messages, which have their own approval systems. WhatsApp Business templates are reviewed by Meta and fall into Marketing, Utility and Authentication categories. If you want to add WhatsApp alongside SMS, the WhatsApp message API guide<\/a> explains how it works.<\/p>\n Six operator DLT portals are active in India: Jio TrueConnect, Airtel DLT, Vi Vilpower, BSNL, Tata and Smartping (the Videocon\/Pingconnect portal). They all follow the same TRAI rules and share one ledger, so you only register your business on one of them. The entity step is where most delays happen, usually because of document mismatches, so prepare your papers before you start.<\/p>\n The main DLT portals in India are Jio TrueConnect, Airtel DLT, Vi Vilpower, BSNL DLT, Tata DLT and Smartping (also known through Videocon and Pingconnect), and registering on any one of them lets your business send SMS on all networks. The rules are the same everywhere. What differs is the look of the portal, its support process, and its fee and renewal terms.<\/p>\n There is no single best DLT portal, because every portal follows the same TRAI rules and your registration is shared with all operators, so choose the one whose interface, payment terms and support you find easiest. If your SMS provider has step-by-step guides for a particular portal, that can make life simpler. Once you pick one, stay with it and keep all your headers and templates there.<\/p>\n No, you register your entity once on any one DLT portal and the registration is shared across all operators, so your SMS can reach Jio, Airtel, Vi, BSNL and other networks from that single registration. Registering the same business on several portals creates duplicate entity IDs and confusion about which one your provider should use. The one exception to “do it once” is PE-TM chain binding, which is handled per operator portal.<\/p>\n Most businesses never need to move, because a registration on one portal already works on every network, and most portals do not offer a simple transfer, so moving generally means fresh registration work. That can include re-doing headers and templates and updating every integration that uses the old IDs. If you are unhappy with a portal’s support, talk to your SMS provider first, since the problem can often be solved without starting over.<\/p>\n For DLT entity registration you usually need your business PAN, a business proof such as a GST certificate or certificate of incorporation, a letter of authorisation on company letterhead, and an ID proof of the authorised person who will manage the account. The exact list depends on your entity type and portal, and the portal shows it during signup. Keep clear colour scans ready as PDF or image files before you begin.<\/p>\n Often yes, because many portals accept other business proofs in place of a GST certificate, such as a certificate of incorporation or a registration or licence issued in the business’s name, depending on your entity type. Check the document list on your chosen portal before you apply. What matters most is that the proof clearly shows the same legal name you type on the form.<\/p>\n DLT is designed for businesses and organisations, so portals ask for business documents, and a private individual with no registered business usually cannot register as a Principal Entity. Freelancers and developers who send SMS for clients should ask each client to register in its own name. The business whose brand is in the message should always be the PE.<\/p>\n A letter of authorisation is a signed letter on your company letterhead, issued by the owner, partner or director, that names the person allowed to create and manage the DLT account on behalf of the business. Most portals provide their own format to download. Use that format word for word, fill every field, sign and stamp it, and make sure the name matches the ID proof you upload.<\/p>\n DLT portals accept most kinds of organisations, including proprietorships, partnerships, LLPs, private and public limited companies, government departments, trusts, societies, NGOs and educational institutions, each picked from an entity type list during signup. Choose the type that matches your legal registration, not how you describe yourself. The document list changes with the type, and a wrong choice is a quick way to get rejected.<\/p>\n To register your business on DLT, choose a portal, sign up with a business email and mobile number, select your entity type, enter your details exactly as they appear on your documents, upload the documents, pay any portal fee and submit for review. After approval you receive your entity ID by email and on the portal dashboard. Our DLT registration process guide<\/a> covers each step in more detail.<\/p>\n A DLT entity ID is the unique number assigned to your business when your Principal Entity registration is approved, and you can find it on your DLT portal’s dashboard or profile page and in the approval email. Your SMS provider needs it to link your account, and it also appears in your PE-TM chain. Save it somewhere your whole team can find it, because you will be asked for it often.<\/p>\n Your entity name must match your documents exactly because DLT reviewers compare the name you type with your PAN, GST or incorporation certificate, and any difference is treated as a possible mismatch and a reason to reject. Small things count: “Pvt Ltd” versus “Private Limited”, a missing word, or a spelling variation. Copy the legal name from your certificate rather than typing it from memory.<\/p>\n Yes, one registered entity can have headers and templates for several brands it owns, as long as each header clearly relates to your business, and reviewers may ask for proof such as a trademark certificate or a website showing the brand. Separate legal companies, even in the same group, need their own entity registrations. Each company’s name, PAN and documents must stand on their own.<\/p>\n Branches that belong to the same legal entity, with the same PAN, are covered by one DLT registration, while franchisees that are separate legal businesses and send SMS on their own need to register in their own name. A common setup is for the head office or franchisor to send all customer SMS centrally from its own entity. Decide this before you register so you do not end up with overlapping headers.<\/p>\n An agency can help a client fill in the forms, but the DLT entity should be registered in the client’s own name with the client’s documents, because the client is the business that owns the messages. The agency or SMS provider then appears as a telemarketer in the client’s PE-TM chain. Registering a client’s brand under the agency’s own entity leads to header rejections and ownership disputes later.<\/p>\n A header is the sender name your customers see at the top of your SMS. It is the first thing a person reads, so it has to be recognisable, and DLT has strict rules about what a header can be. Once your entity is approved, headers are the next step, and every template you register later will be linked to one of them.<\/p>\n A header in DLT is the registered sender ID that appears as the sender of your SMS on the customer’s phone, and every business SMS must go out under a header approved for your entity. For example, a store called ABC Mart might register ABCMRT. The network adds a few extra letters around it when the message is shown, but the core six characters are yours.<\/p>\n A DLT header always has exactly six characters: transactional and service headers use six alphabetic letters, while promotional headers use six digits. Spaces, symbols and mixed letter-number combinations are not allowed. If your brand name is longer, shorten it in a way people will still recognise, like SHRDNT for Sharma Dental.<\/p>\n A transactional or service header is six letters that look like your brand and can carry OTPs, alerts and updates at any time, while a promotional header is six digits used only for offers and marketing, within the allowed hours and to non-DND numbers. Customers can tell at a glance which kind of message they are getting. You cannot send promotional content from a letter header or service updates from a number header.<\/p>\n Choose a header that clearly reflects your registered business or brand name, so a reviewer can connect it to your entity and a customer can recognise it, such as SHRDNT for Sharma Dental Clinic or GRNSCH for Green Valley School. Avoid generic words like OFFERS, ALERTS or INFORM, and never use another company’s name. Write down two or three options before you open the portal, in case your first choice is taken.<\/p>\n A header is usually rejected because it does not clearly relate to your entity name, uses a generic word, looks like another brand or a government body, or was submitted without the supporting proof the reviewer needed. Read the rejection remark on the portal first. Then either pick a header closer to your legal or brand name, or attach proof such as a trademark certificate or a website link showing the brand.<\/p>\n No, you cannot register a header that uses another company’s brand name, because headers are tied to the entity that owns the brand, and stopping impersonation is one of the main reasons DLT exists. Even resellers and agencies cannot register a client’s brand under their own entity. The brand owner registers the header and adds the provider to its PE-TM chain.<\/p>\n You generally cannot edit the text of an approved header, so if you need a different sender name you register a new header, link new templates to it and deactivate the old one when you no longer use it. Update your SMS provider and any integrations with the new header before you switch. Keep the old one active until all your live flows have moved over.<\/p>\n No, a header is unique across the DLT system, so once one entity has registered it, no other entity can take the same six characters on any portal. If someone has registered a header that matches your brand, raise a complaint with your DLT portal’s support and share proof that you own the brand, such as a trademark or company registration. The portal decides such disputes, not your SMS provider.<\/p>\n To register a header, log in to your DLT portal, open the header or sender ID section, choose the category (transactional, service or promotional), enter your six-character header, add a short reason or brand proof if asked, and submit it for review. Once approved it shows as active and works on all networks. You can then link content templates to it.<\/p>\n You do not strictly need a separate header for OTPs, because one alphabetic header can carry OTP, alert and service templates as long as each template is registered in the right category. Some businesses still prefer a dedicated OTP header so customers learn to trust it and it stays apart from order or billing updates. Either approach is fine under DLT.<\/p>\n The extra letters you see before your header, such as a two-letter prefix and a hyphen, are added by the network and are normal, but if the six-character part itself is different, your provider is sending under another header or your template is linked to a different one. First check which header each template is linked to on your portal. Then check the header set in your SMS panel or API call.<\/p>\n Yes, a DLT header and a sender ID are the same thing: header is the term used on DLT portals, while sender ID is the common term used by SMS providers and developers. Some panels also call it a brand name or source address. Whatever the label, it means the six-character name approved on your DLT account.<\/p>\n A content template is the fixed wording of your SMS with placeholders for the parts that change, like a name or an OTP. You register each template under one of three categories, and the category decides who you can send it to, which header it uses and at what time it can go out. Picking the right category is one of the easiest ways to get quick DLT template approval and avoid rejections.<\/p>\n A DLT content template is the approved wording of an SMS, made of fixed text plus variable tags for the parts that change, and operators only deliver business messages that match one of your approved templates. Each approved template gets its own template ID and is linked to one header. For example: Dear {#alphanumeric#}, your order {#alphanumeric#} has been shipped. Track it here {#url#} – ABC Mart.<\/p>\n DLT has three template categories today: Transactional for OTPs, Service Implicit for updates linked to an existing customer relationship, and Promotional for offers and marketing, because the older Service Explicit category has been merged into Promotional. The category controls the header type, the sending hours and whether DND numbers receive the message. The table below sums up the differences.<\/p>\n\n
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![\"DLT](\"https:\/\/www.fast2sms.com\/help\/wp-content\/uploads\/2026\/09\/dlt-registration-5-steps.png\")
What DLT is and why it exists<\/h2>\n
What is DLT in SMS?<\/h3>\n
What is the full form of DLT?<\/h3>\n
Why did TRAI make DLT registration mandatory?<\/h3>\n
Is DLT registration mandatory for all business SMS?<\/h3>\n
Who needs to register on DLT?<\/h3>\n
Do I need DLT registration to send SMS from my personal phone?<\/h3>\n
What happens if I send SMS without DLT registration?<\/h3>\n
What are the steps of DLT registration?<\/h3>\n
What is a Principal Entity (PE) in DLT?<\/h3>\n
What is a telemarketer (TM) in DLT?<\/h3>\n
How does DLT check each SMS before delivery?<\/h3>\n
Does DLT apply to WhatsApp or RCS messages?<\/h3>\n
Choosing a DLT portal and registering your entity (PE)<\/h2>\n
Which DLT portals are available in India?<\/h3>\n
Which DLT portal is best for registration?<\/h3>\n
Do I need to register on every operator’s DLT portal?<\/h3>\n
Can I move my DLT registration to another portal later?<\/h3>\n
What documents are required for DLT registration?<\/h3>\n
Can I do DLT registration without GST?<\/h3>\n
Can an individual or freelancer register on DLT?<\/h3>\n
What is a letter of authorisation for DLT?<\/h3>\n
What entity types can register on DLT?<\/h3>\n
How do I register my business on DLT step by step?<\/h3>\n
What is a DLT entity ID and where do I find it?<\/h3>\n
Why must my entity name match my documents exactly?<\/h3>\n
Can one company register multiple brands on DLT?<\/h3>\n
Do branches or franchises need separate DLT registration?<\/h3>\n
Can an agency register on DLT on behalf of a client?<\/h3>\n
DLT header registration (sender IDs)<\/h2>\n
What is a header in DLT?<\/h3>\n
How many characters can a DLT header have?<\/h3>\n
What is the difference between a promotional and a transactional header?<\/h3>\n
How do I choose a good DLT header name?<\/h3>\n
Why was my DLT header rejected?<\/h3>\n
Can I use another company’s brand name as my header?<\/h3>\n
Can I change a header after it is approved?<\/h3>\n
Can two companies register the same header?<\/h3>\n
How do I register a header on DLT?<\/h3>\n
Do I need a separate header for OTP SMS?<\/h3>\n
Why does my SMS show a different sender name than my header?<\/h3>\n
Is a DLT header the same as a sender ID?<\/h3>\n
Content templates and categories<\/h2>\n
What is a DLT content template?<\/h3>\n
![\"Anatomy](\"https:\/\/www.fast2sms.com\/help\/wp-content\/uploads\/2026\/07\/dlt-template-anatomy.png\")
What are the DLT template categories?<\/h3>\n
![\"Cheat](\"https:\/\/www.fast2sms.com\/help\/wp-content\/uploads\/2026\/07\/dlt-tag-cheatsheet.png\")
![\"Flow](\"https:\/\/www.fast2sms.com\/help\/wp-content\/uploads\/2026\/07\/se-promo-flow.png\")
![\"Diagram](\"https:\/\/www.fast2sms.com\/help\/wp-content\/uploads\/2026\/09\/pe-tm-direct-vs-reseller-vs-tmd-routing.png\")