Verify users instantly through a single missed call — zero SMS cost, real-time authentication, enterprise reliability
Authentication that costs nothing to receive — and everything to bypass
Missed Call OTP is a verification method where the user places a call to a designated number and disconnects before the call is answered. The system detects the incoming call signal, instantly validates the user's registered number, and confirms identity — all without delivering any message.
Gateway.sa provides scalable Missed Call OTP solutions designed for high-volume verification use cases with minimal cost and fast response times, making it the ideal choice for markets with low connectivity or high SMS costs.
Place a call. Hang up. You're verified. No messages needed.
A simple 4-step process that verifies identity in under a second
Mobile Phone
Places Missed Call
Voice Operators
Call Routing
OTP Engine
Number Validation
Website / Mobile App
Access Granted
Where Missed Call OTP delivers the most value across industries
Confirm mobile number ownership during sign-up. Users simply call a number and hang up — their number is verified instantly, with no message to wait for and no delivery failure risk. Ideal for onboarding flows that need speed and simplicity.
Add a friction-free second factor to your login process without relying on SMS delivery or internet connectivity.
Allow users to activate subscriptions, plans, or services with a single missed call — instant, reliable, cost-free.
Capture auditable user consent for terms, policies, or transactions via a tracked missed call event.
For high-volume validations where SMS cost is a concern, missed call OTP dramatically reduces per-verification expense.
Let users reclaim locked accounts through a missed call to their registered number — no SMS dependency, no token interception risk. A secure, channel-diverse fallback for account recovery flows.
Enterprise-grade missed call OTP infrastructure built for speed, scale, and security
Our platform detects incoming call signals within milliseconds, triggering the verification pipeline before the caller even hangs up.
The call is automatically rejected — no connection is established, ensuring zero call cost for both user and business.
Integrate with a simple RESTful API. Receive webhook callbacks with verification status in real time, directly into your application.
Designed to handle thousands of simultaneous verification requests with consistent sub-second response times at any scale.
Caller Line Identification (CLI) is used to match the incoming number against the registered user record, with anti-spoofing protection built in.
When a missed call cannot be completed, the platform automatically triggers a configurable fallback — such as SMS OTP — ensuring no user is left unverified due to network conditions.
Gateway.sa Missed Call OTP is engineered for enterprise trust
Every incoming call is cryptographically matched against the registered session token, preventing replay and injection attacks.
Intelligent rate-limiting and anomaly detection flag suspicious verification patterns before they can succeed.
Verification results are generated and delivered to your API callback in under 500ms from call detection.
Redundant multi-region infrastructure ensures 99.9% uptime, even during peak traffic or regional telecom incidents.
Trusted across sectors that demand fast, affordable, and reliable verification
Five reasons businesses choose us for their verification infrastructure
Verification costs are a fraction of SMS OTP, with no message delivery fees on either side.
Users are verified the instant the call signal is detected — no waiting for delivery.
One action — a call — is all the user needs. No codes to copy, no apps to open.
Built to handle millions of daily verifications with no performance degradation.
ISO 27001 certified infrastructure with multi-region redundancy and 24/7 monitoring.
Everything you need to know about Missed Call OTP
Unlike SMS OTP which delivers a code via text message, Missed Call OTP requires no message delivery at all. The user's identity is verified purely by detecting a call from their registered number. This eliminates SMS delivery costs, removes dependency on network message routing, and works even in areas with poor SMS delivery rates. There is also no code for the user to read and enter — the experience is completely hands-free after initiating the call.
Yes. Gateway.sa implements multiple security layers including session-token binding (each verification attempt generates a unique token that must match the incoming CLI), time-limited windows (calls outside the allowed timeframe are rejected), and AI-powered anomaly detection that flags suspicious patterns such as repeated attempts from the same number, virtual number abuse, or coordinated bot activity. CLI spoofing protections are also enforced at the telecom routing level.
If a call does not reach the platform within the session timeout window (configurable between 60–300 seconds), the verification request expires and a new one can be triggered. Our platform provides real-time status callbacks so your application can immediately inform the user and offer a retry or fallback method such as SMS OTP. Gateway.sa also offers intelligent fallback routing to maximise the chance of call completion across different telecom operators.
Integration is straightforward via our RESTful API. Your backend makes a single API call to initiate a verification session — receiving a unique verification number for the user to call. When the call is detected, Gateway.sa sends a webhook callback to your configured endpoint with the result. We provide detailed API documentation, code examples in Python, Node.js, PHP, Java, and .NET, plus a sandbox environment for testing. Most teams complete integration in under a day.
Join hundreds of businesses using Gateway.sa Missed Call OTP for fast, secure, cost-free verification
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