DLT-रजिस्टर्ड SMS में छोटे लिंक का इस्तेमाल

If you send business SMS in India, every link in your message has to be registered (whitelisted) on your DLT platform first, or operators may block the message. This page explains what that means for short links. It is general guidance, not legal advice — always confirm with your DLT operator or SMS provider.

The rule in one paragraph

Under TRAI's rules for commercial communication, businesses register their Sender IDs (headers) and message templates on a DLT platform run by the telecom operators. Operators now also check the links (sometimes called CTAs) inside messages: links that are not whitelisted for your entity can be blocked. Short links get extra attention — industry guidance says a short link should clearly show its relation to the sender, for example by including the Sender ID in the link. (Source: industry guide, SMS regulations guide.)

What this means for hi4.in links today

• An ordinary link like hi4.in/abc123 does not show your Sender ID, so operators may not accept it in a DLT template. Ask your SMS provider before you use one in a campaign.
• Links in the Sender ID format — hi4.in/SENDERID/offer — are coming soon on the Business plan. They are designed to be whitelisted once per Sender ID. You can join the waitlist on the SMS Links page.
• Until then, the safest option is a link on your own domain that you have whitelisted on your DLT portal.

Checklist before you send

1. Whitelist the exact domain (and path format, if your operator asks for it) on each DLT portal you use, for each Sender ID.
2. Use the same link format in the registered template and in the message you send.
3. Use https links, and avoid links that bounce through several other websites.
4. Send a small test batch to phones on different networks before the full campaign.
5. Count characters: a link takes space in your SMS. Check with the SMS length counter — Hindi and other Unicode messages fit fewer characters per SMS.

You can paste a message into our SMS link DLT checker to spot common problems before you register a template. For a longer explanation, read TRAI SMS link whitelisting, explained simply.