Voice OTP, Worldwide — Carrier-Grade Delivery at Scale
Send OTPs, alerts, and marketing messages across 190+ countries with reliable routes, powerful APIs, and real-time delivery reports.
What Is Voice OTP and How Does It Work?
Voice OTP (One-Time Password) is an advanced two-factor authentication solution that delivers verification codes through automated phone calls using text-to-speech technology. This secure authentication method ensures reliable OTP delivery even in areas with poor SMS connectivity, network congestion, or DND restrictions.
SMS OTP Delivery Challenges
- Low delivery rates in rural and remote areas due to poor network coverage
- Network congestion during peak hours causing significant delays in OTP delivery
- International SMS issues with high costs and unreliable delivery across borders
- DND restrictions blocking promotional and transactional messages
- SMS phishing attacks and SIM swap fraud vulnerabilities
- Carrier filtering causing legitimate OTPs to be blocked or delayed
Voice OTP Solution Advantages
- 99.9% delivery success rate across all geographies and network conditions
- Universal compatibility - works on smartphones, feature phones, and landlines
- Lightning-fast delivery in 3-5 seconds with intelligent retry logic
- Multilingual TTS support with natural voice synthesis in 40+ languages
- Enhanced security with voice biometrics and call recording for audit trails
- Bypass DND restrictions for critical transactional authentication
Higher Reach & Coverage
Voice OTP works on any phone network including GSM, CDMA, and VoIP networks. Delivers verification codes to areas with limited SMS infrastructure, ensuring authentication success even in tier-2 and tier-3 cities.
- Global voice termination
- Local number masking
- Carrier-grade routing
Crystal Clear Voice Quality
Advanced text-to-speech engines deliver OTPs with natural voice quality in multiple languages and accents. Custom audio files supported for branded authentication experiences.
- Neural TTS technology
- Custom voice branding
- Speed & pitch control
Enterprise Security Standards
Voice calls provide secure OTP delivery with encrypted transmission, call detail records for compliance auditing, and protection against SS7 attacks and SIM swap fraud.
- End-to-end encryption
- PCI DSS compliant
- GDPR & ISO certified
How Voice OTP Technology Works
API Request
Your application sends OTP code, phone number, and language preference via REST API
Voice Synthesis
Our TTS engine converts the OTP to natural speech in the selected language
Call Delivery
Automated call placed to user's phone with optimal carrier routing
Real-time Status
Receive delivery confirmation, call duration, and completion status instantly
Transparent Pricing
No hidden fees. Pay only for successful deliveries.
Starter
- Up to 10,000 calls/month
- REST API access
- Basic analytics
- Email support
- 5 languages
Business
- Up to 100,000 calls/month
- REST API + SMPP
- Advanced analytics
- Priority support
- 20 languages
- Custom audio upload
Enterprise
- Unlimited calls
- Dedicated infrastructure
- SLA guarantees
- 24/7 phone support
- All languages
- Custom integrations
