What is voice OTP and when should an Indian business use it instead of SMS OTP?

A Voice OTP service delivers a one-time password through an automated phone call instead of SMS. It is ideal for feature phone users, people in low-connectivity areas, and as a fallback when SMS OTP is delayed or fails. Most businesses in India use a Voice OTP Service in India as a backup rather than the primary verification channel because it improves verification success while reducing signup and login abandonment.