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Why do People Prefer Voice OTPs over SMS OTP 

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Fonada, a trusted CPaaS & cloud telephony solution provider in India, is popularly known for revolutionizing communication with Cutting-Edge Technology. Our advanced customer engagement solutions,...Read more


Fonada, a trusted CPaaS & cloud telephony solution provider in India, is popularly known for revolutionizing communication with Cutting-Edge Technology. Our advanced customer engagement solutions,...Read more


Data security is always a problem for many organizations, and finding a service provider who can provide excellent security has become a top priority. Consumers are always looking for security. OTP verification is a security measure that gives users greater control over their existing account and profile activities.

There are a variety of widely available delivery alternatives for OTPs. SMS OTP is unquestionably the most popular method of OTP distribution. Yet in recent years, many firms have begun to rely on Voice OTP service, either in place of or in addition to SMS, to deliver one-time passwords. 

Customers do not need to worry about any form of data corruption, data leakage, or any kind of fraud anymore. Voice OTP solution can provide your consumers with an additional degree of security. In addition to its speed and reliability, this service will protect its users from potential phishing scams and other threats.

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Briefly Explain The Concept Of SMS OTP

Concept Of Sms OTP

An SMS OTP is a message with a One-Time Password that customers receive after initiating a transaction. An OTP is a one-time authentication code produced automatically by a system and transmitted to users when they log into an application or complete an online transaction. 

Users can only log in or do transactions if they submit the correct OTP within the specified period. The one-time password, or OTP message text, is a kind of authentication that helps prevent fraudulent transactions, unauthorized use, and card fraud.

Describe Voice OTP

A voice OTP is sent through an automated phone call to facilitate two-factor authentication. It is generally preferred if the SMS OTP delivery frequently fails. With the voice OTP feature, organizations can authenticate using an OTP sent via a telephone call to the registered contact number. This OTP is valid for authentication in a short amount of time. 

Every time a user tries to authenticate from a new device, the OTP given is verified to the OTP made on the server. If the two OTPs match, a business has successfully been authenticated.

Unlike SMS OTP, which is subject to limitations like DND and other strict guidelines, Voice OTP provides greater flexibility.

It is a phone call, which typically carries fewer restrictions. Voice OTP also seems more prompt because SMS transmission delays and traffic difficulties are irrelevant.

Properties of Voice OTP Solutions

Properties of Voice OTP Solutions

  • TTS (Text-To-Speech): The flexibility of this solution allows the business to create customized conversations before delivering the OTP to the customer. After entering the OTP message text, the system will provide it before prompting for the OTP.
  • Forward Call Detection: When a voice OTP is triggered, the system determines whether it should be forwarded to another number. If so, the system can do something about that number. The system can block the number or warn of an additional verification effort.
  • The Caller ID: The system assigns a unique number to the caller ID of any voice OTP call. A user can quickly and easily determine if a call is legitimate.
  • Dismiss the answering machine: A call will be automatically disconnected if the user has dialed into voicemail or an answering machine. This secures the passcode or OTP. Human interaction is required to obtain the OTP.
  • Vocal-Based Passcode System: Voice OTP can help businesses check a user’s identity in real-time without risking security. The OTP message text will be audible over the phone, and the customer can enter it immediately after hearing it. It is more secure than previous verification methods and operates in real-time.
  • Quick Verify: Now, you can quickly check any transaction or session. The Voice OTP call only takes a few seconds to deliver. Use the Voice OTP option instead of waiting for text messages for quick verification.
  • Operational Expertise: Businesses can send a lot of voice OTP calls simultaneously with other operations. The cloud-based Voice OTP authentication mechanism simplifies the entire OTP SMS service process. It controls them.
  • Voice Failover: The client wanted to ensure that time-sensitive messages arrived on time, like forwarding OTPs to customers. It was necessary to find a way to guarantee the transmission of such messages when the SMS OTP effort failed. Route Mobile delivers the same OTP information over the transactional route if the SMS isn’t offered. After receiving the Voice OTP and responding to the voice call, the user types the OTP messages.
  • Pin Generation: With this system, you can generate a one-time PIN (OTP) that is unique to you and cannot be used more than once. Every PIN is different.
  • Worldwide Coverage: This OTP SMS service has the highest delivery rates and the fastest speeds, sending OTPs to over 800 networks. So, you no longer have to worry about how far away your customers are. This ultimate service will cover all of them.

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Popular Uses for Voice OTP:

Voice OTP


It is possible to use voice OTP to verify that the passcode generation or reset procedure is successful. Yet, it can also serve as a password to enter the system. A user can request a more secure login method by using voice OTP.


Any account change or deletion can be verified with a voice OTP. You can create a new password, modify the old one, verify your account, delete your account, ask for two-factor authentication with human verification, and change your account settings.


Voice OTP is a trustworthy service you may use whenever you need to reactivate your account to access a program, portals, websites, or anything else.


A company can use the service for much more than financial transactions. Using voice OTP ensures the safety of all financial transactions, whether they involve virtual or actual money.


Finally, voice OTP might help verify any actions on their platform involving account creation or a financial transaction. This verification will never add unnecessary steps to your website or reduce the level of your users’ experience.

How Does Voice OTP Work?

Voice OTP Work

Step 1: Request

Voice OTP requests can be initiated from either the user or system end. The user can have the system send them a voice OTP for verification purposes, or the system can do it automatically.

Step 2: Generate OTP

The API generates a random OTP after it has received the request to do so. The OTP password is converted to voice using Text-to-Speech using API. After it is complete, API integrates it with the IVR system.

Step 3: Make the Call

The system will now make the first call. The user must pick up the phone and listen carefully as the IVR says the OTP. Before the one-time password (OTP) expires, the user needs to enter it into the appropriate field.

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Why Voice OTP Authentication Is the Best Option for Businesses

OTP Authentication Is the Best Option for Businesses

With the Voice OTP service, businesses can verify a user by calling the user’s mobile phone and repeating a set of digits.

Increases OTP Delivery Rates to 99.9%

When businesses use voice OTP and OTP SMS service, their delivery rates can increase to 99% as it’s extremely reliable.


When you can get a voice OTP solution at less than SMS OTP, using both authentication systems is smart. Companies should conserve resources and pay for those resources they consume. Voice OTP Services help organizations expand since they are efficient and cost-effective.

Operational Competence

Organizations can send multiple voice OTP messages at once without impacting other processes. Voice OTP 2FA verification uses voice technology for telephone verification, which is incredibly efficient and trustworthy. More users will be confirmed if additional authentication methods can be used during the process.

Enhanced Security

Voice OTP offers greater security than SMS OTP. To ensure confidentiality, one-time password alerts will only be sent to the user’s phone number. The customer’s password is given only when they pick up the phone, which is a unique feature of this service. This great feature guarantees the safety of OTP codes transmitted via Voice OTP.

Boosts The Level Of Business Engagement

Voice-calling capabilities facilitate an excellent client experience. Moreover, several of these platforms even provide support for regional tongues. This ensures that the organization can serve its customers regardless of their native language. An approach like this promises to raise business engagement levels while increasing consumer satisfaction significantly.

Smart Feature:

Voice OTP can read alphanumeric and numeric messages, as well as quantities that can be configured through the API. If you don’t hear the OTP code in time, you can choose to have it repeat itself as several times as you need.

If the user does not pick up or the phone is engaged after a specific time, the system can be set to call again automatically. The system will log every call you make and its duration and completion status.

Scaling Up Easily:

Voice API systems connect your organization with international carrier networks. This is a tremendous help to companies focusing on serving clients or customers based abroad. They can quickly broaden the reach of their communication strategy using these tools.

Comprehensive Services:

The OTP verification platform provides the most modern comprehensive business solution. This service is fully integrated, so you will not experience problems using it.

Simple Configuration:

It is simple to adapt to the needs of all industries and businesses. You will not need large-scale hardware or an extensive surrounding area to use this service.

Continuous Reporting:

Web and mobile apps now allow real-time logs, reports, and dashboard monitoring. This is the most useful for future reference. You can access it from any location and at any time.

Voice OTPs with Time Sensitivity:

Voice-based OTP works like a two-factor authentication method in the same way that SMS-based OTP authentication does. It is a rapid and dependable notification system that ensures messages are delivered securely and on time to users’ mobile devices. It is usually used for notifications and passwords for various utilities.

Bottom Line:

Voice OTP authentication is an alternate verification process that can be seamlessly incorporated into your existing user verification process. When implemented correctly, it could lower the percentage of failed attempts at phone number verification. It is a more cost-effective alternative to SMS OTP service for phone verification. 

It doesn’t serve as a standalone method of verification. When used to boost the OTP delivery rate, it functions most effectively when configured as the primary verification method.

Frequently Asked Questions

1. What is the significance of SMS OTP?

OTP (One-Time Password) SMS is highly significant and primarily used for authentication. This is created every time a user logs into his or her account, preventing hacking and other similar threats. One-time password (OTP) SMS authentication is a method that can play a significant role in two-factor authentication (2FA) and multi-factor authentication (MFA).

2. What Advantages Does Voice OTP Offer?

The Voice OTP service is safer than SMS because the consumer only hears the code over the phone. The call may get through to the customer faster than an OTP sent via email or text. A voice OTP system can provide additional security for your users.

3. Is It Possible to Hack SMS OTP?

The hacker has readily bypassed the additional safeguards provided by SMS OTP. The victim enters the OTP into the phishing site, and the attacker uses that information to log into the website.

4. Why Do We Need OTP Verification?

Protecting your web-based service from unauthorized access is the key motivation for implementing an OTP procedure. The OTP function avoids certain types of fraudulent activity by preventing the reuse of a captured username and password.

5. How Does SMS OTP Compare to Mobile OTP?

SIM swap attacks can happen with OTP SMS, where an attacker takes over the user’s phone number and gets an OTP meant for the user.

OTP SMS works even when there isn’t good cell phone service or when the user’s phone is turned off or out of range. SMS texts are susceptible to external attacks due to severe system vulnerabilities.


Fonada, a trusted CPaaS & cloud telephony solution provider in India, is popularly known for revolutionizing communication with Cutting-Edge Technology. Our advanced customer engagement solutions, including Voice, Messaging (SMS & RCS), WhatsApp Business, and Conversational AI tools are designed to empower individuals and businesses to communicate effortlessly and efficiently. Embark on a journey into the future of communication with Fonada, and unlock a world of seamless connectivity and productivity.

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