DLT registration (India SMS)
DLT (Distributed Ledger Technology) registration is India's TRAI-mandated framework for commercial SMS. Businesses must register as an entity, register sender IDs (headers) and message templates on a DLT platform, and only send pre-approved content — otherwise messages are blocked.
How it works
You register your entity, header (sender ID) and each message template on a telecom DLT portal. Outbound SMS must match an approved template tied to an approved header, with consent recorded.
Why it matters
Unregistered or off-template SMS in India is rejected by operators. DLT compliance is non-optional for any business sending transactional or promotional SMS to Indian numbers.
What are the four things you register on a DLT platform?
DLT registration has layers, and a message only passes when every layer matches. The entity is your business, registered once with a telecom operator's DLT portal using your company documents. The header is the sender ID the recipient sees. The content template is the approved wording of each message, with placeholders marking the parts that change. The consent template records the wording customers agreed to, where the message category needs explicit consent.
Operators share registrations across the network, so one entity registration is generally visible to other operators. Your SMS provider then needs your entity ID and the template IDs to submit traffic, which is why a provider will ask for both before a first send.
How do template variables work, and why do messages fail on them?
A content template is fixed text with variable slots, commonly written as {#var#} on DLT portals. A template such as "Hi {#var#}, your demo with Acme is confirmed for {#var#}" allows a name and a time to change while the rest must match exactly. The operator compares each outgoing message against the registered text.
Failures come from small drift. Someone edits the copy in the sending tool and adds a word, changes punctuation, or puts a link where the template had none. A variable filled with far more text than intended can also fail the match. When messages suddenly stop delivering after a copy change, compare the sent text character by character with the approved template before blaming the carrier.
Which message category does B2B sales outreach fall into?
DLT sorts messages into categories, broadly promotional, transactional and service messages, where service messages split into implicit and explicit types. A booking confirmation for a demo the prospect requested is closer to a service message. A first-touch sales pitch to someone who never asked is promotional, and promotional traffic is subject to the recipient's do-not-disturb preferences and sending-time limits.
Choosing a service category to avoid those limits is a misclassification that operators can act on. Register the category that honestly fits the content. For a full view of how SMS fits beside email and calls for Indian buyers, see the India cold outreach playbook, and the India-first feature set for the product side.
What should an India SMS rollout look like week by week?
In the first week, register the entity and one header, then two or three templates covering the messages you will actually send, such as a meeting confirmation and a reminder. Keep them short and specific. Once approved, send to a small internal list and confirm that each template delivers. Only then connect the template IDs to live sequences. Autocloz flags a missing DLT registration with a stated reason at send time, and replies from those texts arrive in the same inbox as email. The SMS compliance guide covers the U.S. side if you text both markets.
How Autocloz handles it
Autocloz surfaces DLT requirements in the SMS flow and won't let a non-compliant India SMS attempt pass silently — it flags missing registration with a clear, actionable reason instead of failing quietly.
FAQ
Is DLT registration required for promotional SMS in India?
Yes. TRAI requires entity, header and template registration on a DLT platform for all commercial SMS. Promotional sends also respect DND (do-not-disturb) preferences and time windows.
Related terms
The TCPA is a U.S. federal law that restricts telemarketing calls, autodialed and prerecorded calls, and unsolicited texts. It requires prior consent for certain contact, honors the Do-Not-Call registry, and enforces calling-time windows — with statutory damages per violation that make compliance a real financial risk.
A Do-Not-Contact (or Do-Not-Call) list is a record of people who have opted out of your outreach — or registered on a government DNC registry — whom you must not contact again. Honoring it is both a legal requirement (TCPA, GDPR, CAN-SPAM) and a deliverability/reputation safeguard.
A2P 10DLC is the U.S. framework for sending Application-to-Person text messages over standard 10-digit long-code numbers. Carriers require businesses to register their brand and campaigns (use cases) to send A2P SMS legitimately, with throughput and trust scores tied to that registration.
Cold email deliverability is the share of your outbound cold emails that actually reach the recipient's inbox (not spam, not blocked). It depends on domain authentication (SPF, DKIM, DMARC), sender reputation, mailbox warmup, list hygiene and content — not just whether the email was 'sent'.
Sources
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