Send OTPs & alerts via DLT Approved SMS API

1. Platform Overview & Business Architecture

Distributed Ledger Technology (DLT) is a blockchain-based registration system mandated by telecom regulatory bodies (such as TRAI in India) to control spam and fraud. Under DLT guidelines, businesses must register their corporate entity, sender IDs (headers), and SMS content templates on a certified telecom ledger before sending messages.

The DEV SEC IT DLT Approved SMS API offers a robust gateway that integrates directly with these blockchain ledgers. When you make an API request, our system validates the entity ID, sender ID, and content template against the DLT database in real time. If the payload matches, the message is routed through high-priority telecom channels. This ensures maximum delivery rates and low latency for critical notifications, such as OTPs.

Our infrastructure is designed for high-volume enterprise needs. It handles automatic character encoding conversion for regional languages, provides detailed delivery status logs, and features a smart fallback system that reroutes traffic during carrier downtime.

2. Enterprise SMS Features

3. API Reference & Technical Endpoints

The API operates over secure HTTPS. Below are the request and response details for sending transactional SMS notifications.

{
  "sender_id": "DSITPL",
  "dlt_entity_id": "1102837465201928374",
  "dlt_template_id": "120716182901828734",
  "mobile": "919988776655",
  "message": "Dear customer, your payment of Rs 5000 is successful. - DEVSECIT",
  "unicode": false,
  "route": "transactional"
}

{
  "status": "success",
  "message_id": "msg_9847120ab",
  "mobile": "919988776655",
  "units_debited": 1,
  "timestamp": "2026-08-19T06:10:20Z"
}

4. Understanding DLT & TRAI Compliance

To prevent messaging disruptions, it is important to understand the components of DLT registration:

Key DLT Requirements:

• Principal Entity (PE) Registration: Every business must register their entity on a DLT portal (e.g., Jio, Airtel, Videocon) to receive a unique 19-digit Principal Entity ID.
• Header/Sender ID Binding: Your 6-character sender ID (e.g., `DSITPL`) must be registered under your Entity ID. Transactional headers must be alphabetic, while promotional headers must be numeric.
• Content Template Registration: Every message draft must be registered and approved. Variable parameters must be marked with `{#var#}` tags (e.g., `Your OTP is {#var#}`).
• Scrubbing Process: Telecom carriers automatically scrub SMS traffic. Any message that does not match an approved template is instantly blocked.

5. Security, High-Availability & Multi-Carrier Failovers

Our SMS gateway uses enterprise-grade security and routing infrastructure to ensure maximum reliability:

• Multi-Carrier Failover Routing: The gateway is connected to multiple tier-1 telecom operators. If a carrier experiences downtime, our routing engine automatically redirects traffic to maintain delivery.
• Encrypted API Tunnels: All data is transmitted over secure TLS 1.3 channels. Client credentials and message payloads are encrypted in transit.
• IP Whitelisting & Access Rules: Secure your account by limiting API access to specific server IP addresses.
• Spam & Velocity Limits: Our security filters monitor OTP traffic to detect and block SMS bombing attempts, protecting your account from abuse.

6. Enterprise Use Cases

7. FAQ & Troubleshooting Guide