Text-to-Speech Engine
Dynamic multilingual TTS or pre-recorded audio for any use case.
Voice Call API
Programmable Voice Infrastructure For Critical Communications
Automated outbound calls for OTP fallback, urgent alerts, and scheduled reminders. Enterprise-grade reliability with sub-second API triggers.
- Automated call workflows
- OTP fallback triggers
- Multilingual TTS support
- Real-time call analytics
5M+
Calls processed monthly
99.9%
API uptime SLA
87%
Average pickup rate
<200ms
API response time
!
The Problem- SMS can be missed or delayed during high-traffic periods
- Manual calling workflows are expensive and do not scale
- No automated fallback when primary channels fail
Problem
Critical alerts fail when text-only channels are unreliable
OTP delivery, payment confirmations, and emergency notifications need a fallback that cuts through noise. SMS alone leaves gaps that cost revenue.
Solution
Intelligent voice automation with smart triggers
H2S voice APIs let you launch automated calls for reminders, OTP fallback, and time-sensitive alerts at any scale with real-time monitoring.
The Solution
- Pre-built call templates for rapid deployment
- API and webhook triggers from your existing systems
- Live call status monitoring and outcome analytics
Features
Everything you need to scale
Built for teams that demand performance, reliability, and complete control over their messaging infrastructure.
Fallback Logic
Auto-trigger voice calls when SMS OTP delivery is not confirmed.
Call Scheduling
Batch calls by geography, timezone, or business-hour windows.
Delivery Analytics
Track answer rate, call duration, and completion metrics in real time.
Impact
Measurable business outcomes
+28%
Alert Completion
Voice fallback dramatically improves successful delivery of urgent notifications.
99.9%
API Uptime
Enterprise-grade infrastructure for business-critical call events.
<48 hrs
Go-Live
Launch your first voice campaign with guided implementation support.
Process
Get started in minutes
01
Workflow Planning
Define call triggers, scripts, and escalation logic for your use case.
02
Voice Configuration
Set up language, voice profile, and optimized delivery routes.
03
System Integration
Connect your app or CRM to initiate calls via our REST API.
04
Monitor and Optimize
Track outcomes in real time and optimize based on pickup patterns.
FAQ
Common questions
Yes. Configure automatic fallback logic to trigger a voice call when SMS OTP delivery is not confirmed within your specified timeout.
Yes. We support multiple languages using both TTS and pre-recorded audio content, configurable per campaign or recipient.
Yes. You receive webhook callback events and real-time reports for answered, failed, and completed calls.
Book Demo
Fill in your details. Our team will reach out within 24 hours.
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