Glossary

What is Promotional SMS?

Promotional SMS are text messages sent for marketing purposes — offers, discounts, product launches, event invitations. In India, TRAI regulations restrict promotional SMS to specific time windows (9 AM–9 PM) and require DLT registration.

Promotional SMS use numeric sender IDs (e.g., VD-123456) in India, unlike transactional SMS which use alphabetic sender IDs. They require explicit opt-in, are subject to DNC (Do Not Call) registry filtering, and have specific content restrictions.

InboxCentral's SMS API supports both promotional and transactional SMS with DLT compliance, DNC filtering, and delivery analytics.

Related InboxCentral feature

SMS API

Related terms

DLT (Distributed Ledger Technology for SMS)

A mandatory registration system for commercial SMS in India.

Sender ID

The name or number displayed as the sender of an SMS message.

Transactional SMS

Non-promotional text messages triggered by user actions or system events.

See it in action

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