---
title: How does the Voice Call OTP PIN API work?
description: "You send a request to the API with a text PIN and select a predefined audio clip (e.g., 'OneTimePassword', 'VerificationCode'). The system converts the PIN to audio and delivers it to the recipient's mobile number via a voice call. ###…"
url: "https://www.smsgatewaycenter.com/blog/kb/how-does-the-voice-call-otp-pin-api-work/"
updated: "2025-06-13"
category: OBD Voice Call / Voice Call OTP
---

# How does the Voice Call OTP PIN API work?

You send a request to the API with a text PIN and select a predefined audio clip (e.g., 'OneTimePassword', 'VerificationCode'). The system converts the PIN to audio and delivers it to the recipient's mobile number via a voice call.

### More Related Articles

- [Is the Voice OTP API secure?](https://www.smsgatewaycenter.com/blog/kb/is-the-voice-otp-api-secure/)
- [How does the system handle failed deliveries?](https://www.smsgatewaycenter.com/blog/kb/how-does-the-system-handle-failed-deliveries/)
- [How can I test the Voice OTP API?](https://www.smsgatewaycenter.com/blog/kb/how-can-i-test-the-voice-otp-api/)

Found this useful?[Add as Preferred Source on Google](https://www.google.com/preferences/source?q=smsgatewaycenter.com)