Reliable and Frictionless
Authentication
via Voice Calls

As digital fraud and data breaches rise, strong user verification is essential. Call-based authentication offers a reliable, real-time way to confirm identity via voice calls—more secure than SMS or email. Teleforce’s platform enables fast, scalable phone call verification across apps and systems.

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What is Call-based Authentication?

Call-based authentication is a user verification method that relies on automated phone calls to confirm identity. During the process, the user either listens to a unique one-time password (OTP) or interacts with an Interactive Voice Response (IVR) system to complete the verification. This method provides a secure and reliable alternative to SMS or email-based authentication, particularly in cases where those channels may be prone to delays, interception, or network issues. By leveraging voice calls, call-based authentication ensures a higher level of trust and is especially useful for critical actions like login attempts, transaction approvals, or access to sensitive information.

How Call-Based Authentication Works

1
Phone Number Submission

The user provides their phone number to trigger the authentication process—often during login, transaction confirmation, or account recovery.

2
OTP Creation

A unique one-time password (OTP), valid for a limited time, is generated by the system.

3
Voice Call Initiated

An automated voice call is placed to the user’s phone, delivering the OTP clearly over the call.

4
OTP Entry

The user listens to the OTP and enters it into the app or website to proceed.

5
Verification Complete

If the entered OTP is correct, the system grants access. If incorrect, the user may try again.

6
Retry or Resend Option

Users who didn’t receive or entered an incorrect OTP are offered a safe way to request a new one.

7
Security Logging

All OTP events—successes, failures, and resends—are logged for fraud monitoring and audit purposes.

Enhanced Security Options

  1. Add MFA Layers:Strengthen verification by combining voice call authentication with SMS or email OTPs.
  2. Tailored Voice Prompts: Customize call scripts with your brand name, personalized greetings, or security cues.
  3. Add MFA Layers:Set OTP Expiration:Ensure OTPs expire quickly to reduce the risk of unauthorized access.
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Teleforce Call-Based Authentication – Key Highlights

Reliable OTP Delivery
  • OTPs are sent via voice calls to avoid delays and failures common with SMS.
  • Works effectively even in areas with poor network coverage or SMS filtering.
  • Supports all mobile and landline numbers without needing internet access.
Robust Security and Encryption
  • Uses military-grade encryption to secure all authentication calls.
  • Protects against SIM swapping, phishing, spoofing, and man-in-the-middle attacks.
  • Complies with global security standards like GDPR, PCI-DSS, and HIPAA.
Customizable User Experience
  • Allows branded voice messages with security instructions to build trust.
  • Supports multiple languages to cater to a global audience.
  • Offers Interactive Voice Response (IVR) so users can verify by pressing keys instead of typing OTPs.
Why Choose Call-Based Authentication Over SMS
  • SMS OTPs are prone to SIM swap attacks, phishing attempts, and inconsistent delivery.
  • Call-based authentication offers stronger resistance to these security threats.
  • Provides a more dependable user experience in areas with weak or unstable mobile networks.
  • Ideal for users without data access, as voice calls work without internet connectivity.
  • Teleforce leverages voice communication to improve both the security and accessibility of authentication.
What Sets Teleforce Apart
  • Provides enterprise-level security with advanced authentication protocols to safeguard user data.
  • Supports high-volume verification with seamless scalability and reliable performance.
  • Works in sync with SMS, email, and biometric methods for a flexible authentication setup.
  • Aligns with international compliance standards, including GDPR, HIPAA, and PCI-DSS.
  • Offers round-the-clock expert support to ensure uninterrupted assistance and issue resolution.

Frequently Asked Questions

Learn more about how call-based authentication works with Teleforce.

Unlike SMS OTP, which is sent as a text message, call-based authentication uses a voice call to deliver a spoken OTP or interactive prompt. It offers better delivery rates and higher security.

Yes, Teleforce supports international call routing, ensuring users across the globe receive verification calls reliably.

Absolutely. Call-based verification can be used as a second factor in 2FA workflows, enhancing security for logins and transactions.

Yes, you can personalize the voice messages, add multilingual support, and even integrate with your IVR for interactive verifications.

Teleforce automatically triggers retry mechanisms and can fall back to alternate channels like SMS or email as a backup.