Voice OTP Service India
Secure audio verification codes delivered through crystal clear voice calls. Perfect backup for SMS OTP with multi-language support starting at ₹0.70/minute. Accessible, reliable, and secure authentication for all customers.
Advanced Voice OTP Features
Secure, accessible, and reliable audio verification
Crystal Clear Audio
HD voice quality with noise cancellation ensuring clear OTP delivery in multiple Indian languages
Instant Delivery
Voice OTP calls connected within 5 seconds with automatic retry mechanisms for guaranteed delivery
Enhanced Security
Secure voice transmission with encryption and fraud prevention for sensitive verification codes
Multi-language Support
Voice OTP in Hindi, English, Tamil, Telugu, and other Indian languages with native pronunciation
Accessibility Friendly
Perfect for visually impaired users and customers who prefer audio-based verification
Smart Fallback
Automatic fallback from SMS to Voice OTP when SMS delivery fails or is delayed
Voice OTP Use Cases
Audio verification for enhanced accessibility and security
Login Verification
Secure voice-based authentication for user login and account access verification
Examples:
Features:
Payment Authentication
Voice OTP for secure payment verification and financial transaction authentication
Examples:
Features:
Registration Verification
Voice-based mobile number verification during user registration and onboarding
Examples:
Features:
Voice OTP vs SMS OTP Comparison
Choose the right verification method for your customers
Feature Comparison
| Feature | Voice OTP | SMS OTP |
|---|---|---|
| Delivery Method | Audio call with spoken code | Text message with code |
| Accessibility | Perfect for visually impaired | Requires reading ability |
| Network Dependency | Works on all phones | Requires SMS capability |
| Delivery Speed | 5-10 seconds | 2-5 seconds |
| Cost per Verification | ₹0.70/minute | ₹0.12/SMS |
| User Preference | Audio-preferred users | Text-preferred users |
Voice OTP Integration Guide
Implement secure audio verification in your applications
curl -X POST https://api.messagebot.in/v1/voice/otp \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"to": "+919876543210",
"length": 6,
"language": "hindi",
"voice": "female",
"expiry": 300,
"message": "आपका सत्यापन कोड है {otp}। कृपया इसे किसी के साथ साझा न करें।"
}'Node.js SDK
const messagebot = require('messagebot-sdk');
const voiceOtp = await messagebot.voice.sendOTP({
to: '+919876543210',
length: 6,
language: 'hindi',
voice: 'female'
});Python SDK
from messagebot import VoiceOTP
voice_otp = VoiceOTP(api_key='your_key')
result = voice_otp.send(
to='+919876543210',
length=6,
language='hindi'
)PHP SDK
$messagebot = new MessageBot($apiKey);
$voiceOtp = $messagebot->voice->sendOTP([
'to' => '+919876543210',
'length' => 6,
'language' => 'hindi'
]);Frequently Asked Questions About Voice OTP
Everything you need to know about audio verification in India
Voice OTP delivers verification codes through automated voice calls instead of text messages. Use Voice OTP when: SMS delivery is unreliable, customers prefer audio verification, serving visually impaired users, SMS OTP fails as backup, or targeting users with basic phones. Voice OTP is especially useful for elderly customers and rural areas with poor SMS connectivity.
Voice OTP works by making an automated call to the user's mobile number and speaking the verification code clearly in their preferred language. The user receives a call within 5 seconds, hears a clear voice message with the OTP code, can request the code to be repeated, and then enters the code in your application for verification.
Our Voice OTP service supports Hindi, English, Tamil, Telugu, Bengali, Gujarati, Marathi, Kannada, Malayalam, and other major Indian languages with native pronunciation and clear audio quality. You can set language preferences based on customer location or choice.
Voice OTP pricing starts at ₹0.70 per minute (typically 30-60 seconds per call) compared to SMS OTP at ₹0.12 per message. While Voice OTP costs more, it offers better accessibility, works as SMS backup, and provides higher success rates for customers who don't receive SMS reliably.
Yes, Voice OTP is an excellent backup option when SMS OTP delivery fails or is delayed. Our platform can automatically trigger Voice OTP if SMS delivery fails within a specified time, ensuring users can always complete verification regardless of SMS connectivity issues.
Voice OTP security includes: encrypted voice transmission, secure code generation, rate limiting per number, call recording for audit trails, fraud detection algorithms, IP-based restrictions, and compliance with security standards. All voice calls are monitored for suspicious patterns.
If a Voice OTP call is missed, our system can: automatically retry the call after a short delay, allow manual resend requests, provide SMS OTP as alternative, send callback notifications, and maintain the OTP validity period for multiple delivery attempts.
Yes, you can customize: voice message content and script, voice gender and accent, speaking speed and clarity, language and pronunciation, repeat options and instructions, and background music or tones. All customizations maintain security and clarity standards.
Yes, our Voice OTP analytics include: call completion rates, average call duration, user interaction patterns, language preference analysis, retry attempt tracking, success/failure reasons, geographic performance data, and detailed reporting for optimization and compliance.
Voice OTP integrates seamlessly with authentication systems through REST APIs, webhooks, and SDKs. It can work alongside SMS OTP as primary or backup verification method, integrate with existing OTP workflows, and provide unified verification experiences across multiple channels.
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Enhance Security with Voice OTP
Provide accessible, secure verification for all your customers. Get 100 free voice minutes to test our platform.