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Bulk Voice SMS · Voice OTP + DTMF

Voice OTP + DTMF Pricing

Voice OTP + DTMF delivers a one-time password or a keypad confirmation prompt straight to your customer's phone by voice call — used for login verification, payment confirmation, delivery/order confirmation ("Press 1 to confirm"), and as a reliable fallback when SMS OTP is delayed or blocked.

  • Works on landlines & feature phones too
  • Real-time DTMF keypress capture
  • 24x7 Service route, DND-exempt
  • Automatic fallback for SMS OTP

DLT Voice Header registration is mandatory before sending Voice OTP + DTMF calls. See how it works »

Service route only — no Promotional variant Voice OTP + DTMF is always a Service (Transactional) communication tied to a transaction your customer has already started. It runs 24x7, including on DND/NCPR-registered numbers, on a single dedicated priority route.
Voice SMS Pricing Voice OTP + DTMF Pricing
Choose a pack

Voice OTP + DTMF credit packs

Every pack runs on the dedicated Service/Transactional route. Rates apply per connected call, billed on a standard 30-second pulse.

Quick answer: SMSGatewayHub's Voice OTP + DTMF pricing in India starts at ₹0.30 per connected call for the 1,00,000-call pack and goes up to ₹0.42 per call for the 10,000-call pack, inclusive of 18% GST. Every call is billed on a standard 30-second pulse (1 credit per 30 connected seconds), runs 24x7 on the Service/Transactional route (DND-exempt, no time-window restriction), and requires DLT Voice Header registration with an approved call script. Bulk/enterprise volumes are quoted as low as ₹0.24 per call.

10,000 Calls
1 Year Validity
₹0.42/ Call
Amount₹4,200
₹4,956Inclusive of 18% GST
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25,000 Calls
1 Year Validity
₹0.37/ Call
Amount₹9,250
₹10,915Inclusive of 18% GST
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50,000 Calls
1 Year Validity
₹0.32/ Call
Amount₹16,000
₹18,880Inclusive of 18% GST
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1,00,000 Calls
1 Year Validity
₹0.30/ Call
Amount₹30,000
₹35,400Inclusive of 18% GST
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Looking for higher volume? Call us on +91-9907922122

Need 5,00,000+ Voice OTP Calls?

Bulk volume rates as low as ₹0.24 per call — talk to our sales team for a custom quote tailored to your exact volume.

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✓ Voice OTP + DTMF is a Service Implicit (Transactional) communication under TRAI's TCCCPR framework — exempt from the Promotional time window and DND/NCPR blocking, the same way Transactional SMS is.

Please Note

  • Voice OTP + DTMF rates above are quoted per connected call, billed on a 30-second pulse, and are exclusive of GST; the adjoining "Inclusive of 18% GST" figure is your final payable amount.
  • Billing Pulse: 1 credit = 1 pulse of up to 30 connected seconds. A 28-second call is billed as 1 credit; a 45-second call crosses into the second pulse and is billed as 2 credits. Pulses are counted only from the moment a call is answered.
  • DLT Voice Header registration: TRAI mandates registration of your Voice Header (Sender CLI) on the DLT platform, plus approval of your OTP/DTMF call script, before you can send Voice OTP + DTMF calls. Know More
  • INR 5,900 including GST has to be paid to the telecom operator as DLT registration charge. If the entity is already registered with another operator, these charges are not applicable.
  • Custom DTMF flows (multi-key menus, multi-language prompts) may attract a one-time setup fee — confirm with our sales team before you finalise your script.
  • * Prices are subject to change without notice. Pricing and availability may vary.

Signup Process for Voice OTP + DTMF

Important Awareness Notice

Don't be fooled by voice OTP providers quoting rates far below the industry standard. Some providers count every dialled attempt — including busy, switched-off or unreachable numbers — as a billable call, so only a fraction of what you pay for actually reaches a live customer. Please confirm how a provider defines a "billable call" before you buy; we're committed to industry-best service & support at a transparent, competitive price.

How we're different: you never pay for a call that didn't connect
📞 Bills only successfully connected calls ⏱ Standard 30-second pulse, no rounding tricks 📊 Real-time call & DTMF reports

Busy, switched-off, unreachable or invalid numbers are automatically excluded from your usage — the same real-time reporting transparency as our SMS platform.

See how Pay-Only-for-Delivered billing works »
How it works

From API call to verified customer, in one voice call

Voice OTP + DTMF adds a keypad-based confirmation layer that plain SMS OTP can't — useful whenever you need a spoken code, a "press 1 to confirm" action, or a typed-in PIN, on any phone.

Voice OTP Spoken code

Your system triggers an API call; the customer receives a voice call that reads out the OTP digit-by-digit, with repeat and slow-speed options. Works even when SMS delivery is delayed, blocked, or the number is a landline.

DTMF Confirmation Keypad input

The call prompts the recipient to press a key or enter a PIN on their keypad — e.g. "Press 1 to confirm delivery" or "Enter your 4-digit code now." The keypress is captured and pushed back to your system in real time.

Read the full DLT Voice compliance guide »
Included with every pack

Voice OTP + DTMF features

Purpose-built for verification and confirmation flows — with keypad capture, real-time callbacks, and API access built in.

  • Digit-by-digit OTP readout
  • Multi-language voice prompts
  • DLT-compliant Voice Header
  • Powerful developer APIs
  • 99.99% server uptime
  • Real-time DTMF keypress capture
  • Configurable retry attempts
  • Instant webhook / API callback
  • Automatic SMS OTP fallback pairing
  • Network redundancy
  • Works on landlines & feature phones
  • HTTPS secure gateway
  • Real-time delivery & call reports
  • CLI-based delivery, no app needed
  • Mobile responsive dashboard
Why us

What makes SMSGatewayHub stand apart?

There are fewer than 10 actual telecom-grade voice call providers in India with their own infrastructure — the rest are resellers claiming to be direct providers.

StepsSending Voice OTP with SMSGatewayHubSending Voice OTP without SMSGatewayHub
Turn Around TimeGo live within 30 seconds and start sending calls instantlyMinutes for account activation, hours/days for Voice Header activation
Login ProcessSimple, quick and easy signupLong registration process, confusing forms
Integration & APICreate or integrate your app in less than an hourYou need to invest time & money on developers to integrate
Technical Know-howNo technical knowledge requiredTechnical know-how required for integration
AffordabilityAffordable rates with proper service and support, no setup cost, no hidden feesEither insane rates, or low quality service with fancy rates and no delivery
Customer SupportAward-winning hybrid sales-cum-support team, instant answersNo one cares about you after the sales pitch got you in
Trusted & verified

Security and compliance you can verify

Independently audited, not self-declared — the same standards banks and fintechs rely on for OTP and transactional voice communication.

ISO 27001Information security
ISO 9001:2015Quality management
SOC 2 ReportAvailable on request
VAPT TestedVulnerability & pen-tested
99.97% UptimeLast 30 days
View the full Trust Center »
Common questions

Voice OTP + DTMF pricing, explained

What is Voice OTP + DTMF and how is it different from Voice SMS?

Voice OTP + DTMF is a dedicated Service (Transactional) route used only for one-time-password verification and keypad (DTMF) confirmations — for example, a caller pressing 1 to confirm a delivery or entering a PIN via keypad. Unlike Voice SMS, it has no Promotional variant, runs 24x7 on a single priority route, and is billed and DLT-approved separately.

Can Voice OTP calls reach DND / NCPR-registered numbers?

Yes. Voice OTP + DTMF calls are Service Implicit communications tied to a transaction the customer has already initiated, so they are exempt from the Promotional time window and DND/NCPR blocking that applies to marketing voice calls.

How does DTMF input capture work on a Voice OTP call?

During the call, the recipient is prompted to enter a PIN or press a key (e.g. "Press 1 to confirm") using their phone's keypad. The keypress is captured in real time and returned to your system via webhook or API callback, so you can confirm the verification instantly.

Is DLT Voice Header registration mandatory for Voice OTP + DTMF?

Yes. A registered Voice Header (Sender CLI) on the DLT platform is required before you can send Voice OTP + DTMF calls, along with approval of your call script/prompt under the Service category.

How is a Voice OTP + DTMF pack billed?

Rates apply per connected call, billed on a standard 30-second pulse — 1 credit covers up to 30 connected seconds, 2 credits cover 31–60 seconds, and so on. Busy, switched-off, unreachable, or invalid numbers are not charged.

Why use Voice OTP instead of, or alongside, SMS OTP?

Voice OTP works as a reliable fallback when SMS is delayed, blocked, or the number can only receive calls (including landlines), and DTMF confirmation adds a second verification factor beyond just reading a code. Most businesses run it alongside SMS OTP as an automatic failover.

Is GST included in the listed price?

The per-call rate and base Amount are shown exclusive of GST. The adjacent figure marked "Inclusive 18% GST" is the final amount you pay.

Can I upgrade to a higher volume pack later?

Yes, you can purchase any higher pack at any time and the new credit is added to your existing balance, valid for 1 Year from the date of that purchase.

Fine print

Voice OTP + DTMF Terms & Conditions

View full Terms & Conditions
✓ Applicable under TRAI's Telecom Commercial Communications Customer Preference Regulations (TCCCPR), as amended. Voice OTP + DTMF is classified as Service Implicit (Transactional) and is exempt from the Promotional time window and DND/NCPR blocking.

Voice OTP + DTMF — Service / Transactional Route

  • Ideal For: OTP/2FA verification, login confirmation, payment confirmation, delivery/order confirmation via keypress, and any flow that needs a spoken code or a DTMF response tied to a transaction your customer has already initiated.
  • Permitted 24x7x365, including on DND/NCPR-registered numbers, once your Voice Header and call script are approved.
  • Requires a registered Voice Header (Sender CLI) on the DLT platform before dispatch, dedicated to the Service/OTP category.
  • Must only be used for genuine verification/confirmation tied to a customer-initiated transaction — using this route for marketing or promotional content is a violation of your undertaking and can lead to the Header/Entity being suspended or blacklisted on TRAI's DLT platform.
  • Call script/prompt approval is required before your first campaign; share the exact wording (including any DTMF prompts) for Service-category approval.
  • Billed per connected call on a 30-second pulse (see Billing Pulse below); busy, switched-off, unreachable or invalid numbers are not charged.
  • Payment is 100% advance; GST @ 18% is mandatory on all packages.
  • Credit validity: 1 Year from the date of purchase.

Billing Pulse

  • Voice OTP + DTMF calls are billed on a standard 30-second pulse, in line with industry practice for Voice SMS/OBD in India. 1 credit = 1 pulse of up to 30 connected seconds — e.g. a 28-second call costs 1 credit, and a 45-second call crosses into the second pulse and costs 2 credits.
  • Pulses are counted only from the moment a call is answered by the recipient; dialling, ringing, and unanswered/busy/switched-off attempts are never billed.
  • DTMF keypress capture does not add to the pulse count beyond the connected call duration itself.

General

  • Do email us the payment details with transaction ID at support@smsgatewayhub.com.
  • Setup fee applies for custom multi-key DTMF flows or multi-language prompts — confirm the amount with our sales team before finalising your script.
  • Any changes in rules and regulations by TRAI or the Operator will be applicable with effect from the date of communication.

Important Awareness Notice: Don't be fooled by voice OTP providers selling calls below the industry standard by billing every dialled attempt as connected. Please stay away from those providers — we remain committed to industry-best service & support at the competitive, lowest possible price, billed only on successfully connected calls.

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