As instances of cybercrimes continue to rise, it has become vital for companies to make sure that only authorized individuals have access to sensitive information. OTPs are among the most common and robust security measures used by various businesses. It is a two-factor authentication process that significantly reduces the chances of fraudulent activities, and allows users to have better control over any action involving their profiles and accounts. Traditionally, SMS was the only channel used for sending OTPs. However, with time, the popularity of Voice based OTP services in India has considerably gone up. Voice OTPs can provide an extra degree of security to the users, and lowers the risk of data security and phishing assaults substantially. This two-factor authentication process enables businesses to authenticate the identity of the users with OTP provided through a phone call to the registered phone number. Users have to use this OTP for authentication in a short amount of time.