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Two-Factor Authentication
Fast, reliable SMS or voice OTP delivery via a developer-friendly API and global telecom backbone, so your 2FA flows are secure, compliant, and consistently delivered.
While passwords are useful to verify what users “know,” voice and text verifications help to validate what users “have.” Our APIs and infrastructure make it easy to use voice and text for two-factor authentication (2FA).
Your application’s security can be compromised when your users re-use passwords from other sites that get hacked or during phishing attacks designed to steal your users’ credentials. Adding two-factor authentication is an important step towards protecting your users’ data when their credentials have been compromised.
Unlike other two factor authentication methods including hardware tokens or authenticator apps, SMS and voice login verification only require a valid phone number, which you can collect and verify during user signup.
Our APIs enable you to interact with users via SMS or voice. The voice interaction includes the appropriate text-to-speech, DMTF (touchtone) and speech-to-text algorithms to enable you interact with your users as you desire.
The evolving threat environment has put security budgets under strain. Our low prices for both SMS and voice have prompted many application developers to implement their two-factor authentication with SignalWire.
Add voice or SMS verification to any app fast on a platform designed by the original geeks of software-defined telecom.
SignalWire's APIs enable 2FA via SMS or voice. For SMS 2FA, a one-time passcode is sent to the user's phone number. For voice 2FA, the OTP is read aloud using text-to-speech, and users can confirm via DTMF input or speech recognition.
Unlike authenticator apps or hardware tokens, SMS and voice verification only require a valid phone number — something most users already have. This lowers friction during signup and reduces abandonment rates, particularly in consumer-facing applications.
Yes. SignalWire's 2FA implementation is backward compatible with Twilio's XML and SDKs, making it straightforward to migrate an existing Twilio-based 2FA flow to SignalWire — often by just updating the base URL and credentials.
SignalWire supports both short codes and local long-code numbers for SMS 2FA delivery, giving you flexibility to optimize for throughput, trust, or regional requirements depending on your user base.
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