DLT Header
A DLT Header (registered sender ID) is required by TRAI for promotional and transactional SMS in India. It identifies the sender and prevents unauthorized messaging.
What it is
The header is a verified alphanumeric sender ID approved on a Distributed Ledger Technology (DLT) platform. SMS gateways check it against registered templates and sender profiles.
Best practices
- Register the header and message templates on your DLT portal.
- Apply consistent headers across bulk campaigns.
- Use fast, compliant link domains to reduce filtering.
With Cuttly in practice
Add headers on your branded domain or use 2s.ms for extra-short links. See guides: Custom Domains & Headers, 2s.ms Domain & Headers.
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