URL Shortener for India and TRAI SMS Compliance 2s.ms Domain, DLT Headers, Branded Links and Carrier-Safe SMS Campaigns

India is the world's second-largest SMS market.
It also has specific requirements for every link inside those messages.

Businesses sending commercial SMS to Indian mobile numbers operate under TRAI's DLT framework — a regulatory system that mandates registered sender headers, pre-approved message templates and specific URL formats. A link in an Indian commercial SMS is not just a redirect; it is a compliance element. Get it wrong and the message is blocked before it reaches the recipient.

Cuttly is one of the few link management platforms with dedicated TRAI compliance infrastructure: the ultra-short 2s.ms domain designed specifically for the DLT header format, support for custom branded domains in TRAI-compliant link structures, and full TRAI URL shortener tools integrated into the platform. This guide explains how Indian SMS compliance works, how the URL format works exactly, and how to set up TRAI-compliant short links for any type of campaign.

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What TRAI's DLT Framework Requires

TRAI (Telecom Regulatory Authority of India) introduced the DLT (Distributed Ledger Technology) framework for commercial SMS to reduce spam and fraudulent messages reaching Indian mobile subscribers. The framework operates at the telecom carrier level — non-compliant messages are filtered and blocked before delivery.

DLT compliance requires three registrations for any business sending commercial SMS in India:

• Entity registration. The sending business must register on the DLT platform of one or more telecom providers (Airtel, Jio, Vi, BSNL).
• Header registration. The sender ID — a 6-character code that identifies the sender — must be registered and approved. Recipients see this HEADER as the sender name in the SMS (e.g. MYBIZZ instead of a random phone number).
• Template registration. Every message format must be pre-registered. The actual message sent must match the registered template structure — variable fields for personalisation are allowed, but the overall format must be consistent with the approved template.

The URL requirement is the element most directly relevant to link management. Every URL included in a commercial SMS must have its static portion whitelisted on the DLT platform — and the URL structure must embed the registered HEADER within the link path.

The Correct URL Format: HEADER Inside the Path

This is the most critical technical point. The HEADER is not prepended before the domain — it is embedded as a path segment after the domain and before the dynamic short link ID.

The structure has two parts — static and dynamic:

• Static (whitelisted) portion: https://2s.ms/HEADER/ — this exact string must be registered and whitelisted on the DLT platform. It never changes between messages.
• Dynamic portion: the unique short link ID that follows — abc123, xyz789 etc. This changes per link or per campaign. Because the static portion is whitelisted, the carrier accepts any dynamic value that follows it.

The carrier filtering system checks that the static portion of any URL in a message matches an approved whitelisted entry. If the https://2s.ms/HEADER/ portion is correctly registered, any dynamic short link using that structure passes carrier validation.

Why the 2s.ms Domain Exists

Standard SMS messages are 160 characters long. A TRAI-compliant URL must include the domain, the HEADER path segment and the dynamic short link ID — all within a message that also needs to contain actual content. The 2s.ms domain was created to minimise the character cost of the URL while still accommodating the full required structure.

For high-volume SMS campaigns where every character of message content matters, the domain length difference is meaningful. For short promotional messages where character count is not a constraint, a custom branded domain works equally well and adds brand identity to the link.

Setting Up TRAI-Compliant Links in Cuttly

Cuttly's TRAI tools are available from the Single plan and above. The complete setup process:

1. Complete your DLT registrations. Register your entity, HEADER and message templates on the DLT platforms of the relevant telecom providers. This is done directly with the telecom operators (Airtel Business, Jio, Vi, BSNL) — not within Cuttly.
2. Add 2s.ms/HEADER/ in Cuttly. In your Cuttly dashboard, add your whitelisted HEADER under the 2s.ms domain. The Knowledge Base guides walk through this step by step: How to Add the 2s.ms/HEADER/ Domain for TRAI Compliance.
3. Create short links under 2s.ms/HEADER/. Every link you create now generates a URL in the format https://2s.ms/YOURHEADER/uniqueID — automatically TRAI-compliant.
4. Register the static URL portion on DLT. Submit https://2s.ms/YOURHEADER/ as a whitelisted URL in your DLT template registrations. All dynamic short links that follow this static portion will be accepted by carrier filters.
5. Include the full URL in your registered SMS template. The message template must show the URL format. The dynamic short link ID is treated as a variable field in the template.

Full step-by-step guides with screenshots: TRAI SMS Compliance — Custom Domains & Headers Guide and TRAI SMS Compliance — 2s.ms Domain & Headers Guide.

For teams using Cuttly's Team dashboard: Adding and Using 2s.ms/HEADER/ in Cuttly's Team Dashboard.

2s.ms vs Custom Branded Domain: When to Use Each

The same Cuttly account manages 2s.ms HEADER links and branded custom domain links simultaneously. Analytics for all links live in one dashboard regardless of which domain was used — a campaign running via Indian SMS and email has unified engagement data in one view.

Who Needs TRAI-Compliant Short Links

Any business sending commercial SMS to Indian mobile numbers requires TRAI compliance — regardless of where the business is headquartered. TRAI's regulations apply to the destination numbers, not the sender's location. Industries with particularly high Indian SMS volumes:

• E-commerce and retail. Order confirmations, shipping updates, flash sale alerts, cart abandonment messages — all containing links that must comply with TRAI URL format.
• Banking and payments. Transaction alerts, OTP messages, account notifications, payment confirmation links. Financial SMS is among the most scrutinised categories under TRAI.
• EdTech and online education. Class schedule notifications, assignment reminders, course material links, exam result notifications.
• Travel and booking platforms. Booking confirmations, check-in reminders, itinerary links, transport updates.
• Healthcare and diagnostics. Appointment reminders, test result notifications, prescription collection alerts.
• FMCG and consumer brands. Promotional campaigns, loyalty communications, product launch notifications.

Analytics for Indian SMS Campaigns

Every 2s.ms/HEADER/ short link includes the same full click analytics as any other Cuttly link: total clicks, unique clicks, device type, OS, browser, country breakdown, referrer and hourly timing. Device analytics typically show very high mobile percentage for Indian SMS campaigns — useful for ensuring destination landing pages are mobile-optimised.

Campaign tag analytics (Team plan) aggregate all links in an SMS campaign into one view. For a multi-wave campaign — announcement SMS, reminder SMS and last-chance SMS each using a different link under the same campaign tag — the campaign view shows total cumulative engagement with timing breakdown per wave.

Bot click filtering (Single plan) is particularly useful for high-volume Indian SMS campaigns where carrier preview systems and security scanners may generate automated clicks. Filtering bot traffic from human engagement gives an accurate picture of actual campaign reach.

Beyond SMS: Full Link Management for India

TRAI compliance addresses the SMS channel specifically. But businesses in India operate across multiple digital channels — and the 2s.ms/HEADER/ format is SMS-only. For all other channels, standard branded short links on a custom domain work without any TRAI-specific formatting.

WhatsApp Business is India's dominant messaging platform for business communications. Links in WhatsApp messages do not require the TRAI HEADER format. Branded short links on a custom domain work cleanly and are more trustworthy than the 2s.ms domain in a WhatsApp context where brand identity matters more than character brevity.

The full picture of Cuttly's India-specific capabilities — 2s.ms/HEADER/ setup, TRAI tools, custom domain support and multi-channel analytics — is on the dedicated TRAI URL Shortener tools page.

Recommended Setup for India SMS Campaigns