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Voice OTP service in India

Some percentage of SMS OTPs always fails — weak signal in a basement, a full inbox, a feature phone, a user who cannot read English. A voice OTP calls the number and reads the code aloud, twice, in the language you choose.

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Automatic SMS fallback10+ Indian languagesRepeated twiceWorks on feature phonesSame verify endpoint
OverviewHow it worksPricingUse casesFAQ
📞Voice OTP

When the SMS OTP does not arrive, the phone rings instead.

Every signup funnel leaks at the OTP step, and the leak is bigger than most teams think because the users it affects never complain — they simply give up. A voice OTP is the cheapest rescue available: if the code has not been verified within the window you set, the platform places a call and speaks it. You pay only for calls that actually connect, and only for the users who were about to be lost.

It also reaches people SMS structurally cannot. A customer who cannot read English, a parent on a feature phone, a delivery partner with a cracked screen — a spoken code in Hindi, Marathi, Tamil or Bengali works for all of them. For your developers nothing changes: the same verify endpoint, the same transaction, one extra channel behind it.

  • Automatic fallback — fires if the SMS OTP is not verified within your chosen window.
  • Text to speech in Indian languages — Hindi, Marathi, Gujarati, Tamil, Telugu, Bengali and more.
  • Code repeated twice with a keypress option to hear it once more.
  • Works on feature phones and on any number that can receive a call.
  • Same verify endpoint as SMS OTP, so your application logic does not change.
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How it works

From enquiry to first message, usually the same day.

Set the fallback window

Thirty seconds is typical. If the SMS OTP has not been verified by then, the voice call is placed automatically.

Pick the language and voice

Per application, or per user if you store a language preference. Text-to-speech generates the audio, so there is nothing to record.

The call reads the code

Twice, with a keypress to repeat. Unanswered calls cost nothing because billing is per connected call.

Verify as usual

The customer enters the code into the same screen and your existing verify call confirms it. No new logic.

Pricing

What it costs, written down.

Rates are quoted excluding GST; the amount you actually pay includes 18% GST and is worked out for you in the table. No setup fee, and a GST invoice for everything.

Voice call and voice OTP pricing
VolumeRate per call (ex GST)Base amount You pay (incl. 18% GST)Validity
5,000 call₹0.37₹1,850₹2,1831 year
10,000 call₹0.36₹3,600₹4,2481 year
25,000 call₹0.33₹8,250₹9,7351 year
50,000 call₹0.31₹15,500₹18,2901 year
1 Lakh call₹0.29₹29,000₹34,2201 year
2 Lakh call₹0.29₹58,000₹68,4401 year
5 Lakh call₹0.27₹1,35,000₹1,59,3001 year
10 Lakh call₹0.25₹2,50,000₹2,95,0001 year

Billed per connected call. Unanswered calls are not charged.

Full slab table, GST working and every other service rate on the voice call price — or see the complete price list.

Where it is used

The jobs it actually gets hired for.

🔒Rescuing failed signups

The core use: catching the users whose SMS never arrived.

  • Registration fallback
  • Login retry
  • Checkout verification

🌐Low-literacy audiences

Where a spoken code in the local language simply works better.

  • Rural and semi-urban users
  • Gig and delivery workers
  • Senior customers

📱Feature-phone users

Numbers that can take a call but not an app or a smart inbox.

  • Agent and dealer networks
  • Field staff verification
  • Cash-collection confirmation
☛

Use it as a fallback, not as the first channel

Voice costs more than SMS per attempt, so firing it first wastes money on the majority of users whose SMS would have arrived fine. Set it to trigger only on non-verification and you pay for it exactly where it earns.

Often taken together

Related services.

🔒

OTP SMS

Priority lane, sub-5-second

Learn more →
🔐

Two-factor (2FA)

Send & verify API, no OTP storage

Learn more →
🔊

Voice call broadcast

One recording, fifty thousand phones

Learn more →
FAQ

Voice OTP, answered.

What is a voice OTP and when should I use it?

A voice OTP is an automated call that reads the code aloud. It is the fallback for when an SMS OTP fails — weak signal, a full inbox, a feature phone, or a user who cannot read the screen easily. Most teams trigger it automatically if the SMS OTP has not been verified within about 30 seconds.

Which languages can the voice OTP speak?

Hindi, Marathi, Gujarati, Tamil, Telugu, Kannada, Bengali, Punjabi, Malayalam and Odia, as well as English. The audio is generated by text to speech, so adding a language is a setting rather than a recording session.

Do I pay for calls that are not answered?

No. Voice is billed per connected call, so an unanswered or busy attempt is not charged. That is what makes it viable as a fallback: you pay only for the rescues that actually happened.

Does my code have to change to add voice OTP?

No. The voice call carries the same code against the same transaction and your existing verify endpoint confirms it. Enabling the fallback is a configuration change on the application, not a new integration.

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