Voice Authentication (Voice OTP)
Voice Authentication (Voice OTP)
Deliver the verification code via voice call - for every user, in every situation.
Some of your users do not consistently use mobile internet, use devices that don't support convenient text messaging, or simply prefer traditional voice communication. It also happens that the bulk SMS channel becomes temporarily overloaded, unavailable, or unreliable. In any of these situations, relying solely on text codes means risking incomplete verification and customer loss. Our Voice Call Authentication service provides secure voice authentication that effectively supports modern user authorization processes and enhances the security of digital services.
Voice authentication
User authentication using voice communication
What do you gain?
Reaching every user profile
You gain an effective and immediate complement to SMS authentication. If the system detects a problem with text message delivery, it automatically switches to voice messaging.
Reliable and automatic backup channel (Failover)
You gain an effective and immediate complement to SMS authentication. If the system detects a problem with text message delivery, it automatically switches to voice messaging.
Independence from local network conditions
The solution is ideal for international markets and regions where the local deliverability of traditional SMS messages may be technologically limited or delayed.
Full synergy thanks to simple integration
The service is quickly launched and managed via a single, universal API, fully consistent with other authentication methods in the NEXT MOBILE portfolio.
How does it work?
The system places a fully automated voice call to the user's number and reads the generated verification code using a natural-sounding voiceover (TTS), without the need for your agents. We prioritize customer comfort – the interface offers a code repeat option, allowing users to listen to the digits again during the same call without having to restart the process. Integration is based on a modern REST API (communication via HTTPS, authorization via a secure API key), allowing for seamless integration of Voice OTP as a key alternative channel into your system architecture.
Key Features
Automatic voice connection – the system calls the user and reads the verification code with a voiceover, without the participation of a consultant.
Possibility of repeating the code – the user can listen to the code again during the same call, without having to initiate a new verification.
Alternative and backup channel – supplements SMS authentication where the text channel is unavailable, unreliable or not preferred by the user.
Reaching users without internet access – and those who prefer voice communication over text.
Integration via API – REST, communication via HTTPS, authorization with API key, consistent with other authentication methods.
For whom?
Banks and financial institutions, fintech, e-commerce, and websites with a diverse user base, including digitally excluded people – wherever reliable code delivery is critical.
Enterprise-class security
- We draw on years of telecommunications experience as a licensed operator. All voice calls are made directly via NEXT MOBILE's own, independent operator infrastructure. All data processing and authentication operations take place exclusively within the territory of the Republic of Poland – confidential information never leaves the country. We ensure full compliance with ISO and GDPR standards, guaranteeing strict data encryption and full control of infrastructure access at every verification stage.