Broadcast high-impact pre-recorded audio messages, interactive DTMF surveys, and automated transactional alerts to millions of phone numbers across India simultaneously. SMSINDIAHUB provides telco-grade Outbound Dialing (OBD) powered by 10,000+ concurrent SIP channels, multi-lingual Text-to-Speech (TTS), intelligent auto-retry, and sub-100ms CRM webhooks.
Verified technical standards, TRAI compliance specifications, and billing mechanisms for Indian enterprise outbound calling.
A voice call service provider in India delivers carrier-grade cloud telephony infrastructure to broadcast automated pre-recorded audio messages, dynamic Text-to-Speech (TTS), and interactive Dual-Tone Multi-Frequency (DTMF) menus to thousands of mobile subscribers simultaneously. Operating on a transparent 30-second pulse billing model, businesses pay strictly for connected calls (₹0.00 for unanswered or busy calls). In full compliance with TRAI TCCCPR (2018), promotional broadcasts are delivered from 9:00 AM to 9:00 PM via 140-series headers to Non-DND numbers, while transactional Voice OTPs and service alerts are delivered 24x7 across all mobile numbers.
Transparent 30-second pulse accounting. You are charged strictly when a subscriber picks up; unanswered and busy attempts cost exactly ₹0.00.
Built-in national DND registry scrubbing for promotional campaigns and official 140-series telemarketing CLI headers under TCCCPR 2018.
In-band RFC 2833 tone capture logs keypresses in <100ms, triggering automated CRM webhooks or live bridging to human support agents.
| Telephony Parameter | SMSINDIAHUB Standard Specification |
|---|---|
| Billing Pulse Duration | 30 Seconds per Pulse (Pay for connected calls only) |
| Broadcast Concurrency | 10,000+ Simultaneous SIP/PRI Channels |
| Promotional Calling Hours | 9:00 AM to 9:00 PM IST (Non-DND numbers) |
| Transactional / OTP Calling Hours | 24x7x365 Round-the-clock Delivery |
| Caller Line Identification (CLI) | Verified 140-series telemarketing headers |
| DTMF Response Capture | RFC 2833 In-Band Keypad Audio Tone Detection |
| Audio Synthesis Engine | WAV/MP3 upload or AI Text-to-Speech (TTS) |
| Automated Retry Logic | Up to 3 configurable automated retries |
A bulk voice call (Outbound Dialer - OBD) service is an automated telecommunication system that broadcasts pre-recorded audio messages or dynamically generated speech to thousands of mobile and landline recipients simultaneously. When the subscriber answers, the system plays the audio file, records interactive DTMF keypad responses (e.g., Press 1 to confirm), and reports delivery metrics in real time via API webhooks.
Bulk voice calls in India operate on a 30-second pulse billing model. Charges are incurred only when a recipient answers the phone and listens to the broadcast. Unanswered, switched-off, and rejected calls are not billed (or automatically re-queued under configurable retry logic). Pricing starts from ₹0.25 to ₹0.37 per 30-second pulse depending on monthly volume commitments.
Under TRAI TCCCPR (2018) guidelines, voice calls are classified into two streams: Promotional Voice Calls are routed via 140-series numbers and can only be delivered between 9:00 AM and 9:00 PM to Non-DND numbers. Transactional / Service Implicit Calls (such as Voice OTPs, critical banking alerts, and order verifications) are transmitted 24x7 across all numbers including DND registers.
When the outbound broadcast asks recipients to enter input (e.g. "Press 1 for Sales, 2 for Support"), the telecom server detects Dual-Tone Multi-Frequency (DTMF) audio frequencies from the subscriber's phone keypad. The detected digit is instantly bundled into a JSON webhook payload and dispatched to your CRM or application within < 100 milliseconds.
Every answered voice call, DTMF keypress, pulse duration, and completion status triggers an instantaneous JSON HTTP POST webhook payload directly to your application endpoint, CRM (Salesforce, Zoho, HubSpot, LeadSquared), or data pipeline.
{
"event": "voice_call_completed",
"call_id": "vcall_98a72f01eb4c",
"recipient_mobile": "+919876543210",
"status": "ANSWERED",
"call_duration_seconds": 24,
"billed_pulses_30s": 1,
"audio_file_id": "aud_campaign_renewal_hi",
"dtmf_response": "1",
"telecom_circle": "Maharashtra & Goa",
"telecom_operator": "Airtel",
"cli_used": "1409210045",
"dispatched_at": "2026-10-14T15:02:18.420Z",
"completed_at": "2026-10-14T15:02:42.510Z",
"crm_sync_status": "SUCCESS_HTTP_200"
}From pre-recorded audio upload to automated DTMF feedback collection, our carrier cloud delivers campaigns with enterprise precision.
Upload studio-quality WAV/MP3 recordings or convert text scripts to speech in English, Hindi, and 10+ regional Indian languages.
Import contact databases via Excel, CSV, or RESTful API. Define regulatory calling windows, retry intervals, and 140-series CLI.
Direct PRI and SIP trunk interconnects dial up to 10,000 calls concurrently across Jio, Airtel, Vi, and BSNL with automatic failover.
Capture DTMF keypresses in real time, route interested respondents to live agents, and push granular delivery metrics to your CRM.
Engineered for high reliability, carrier redundancy, and maximum recipient engagement.
Broadcast high-volume pre-recorded voice clips to thousands of contacts with automated dialing, instantaneous carrier connection, and 30-sec pulse accounting.
Inject personalized customer variables (e.g., customer names, outstanding balances, order IDs) converted into natural speech in Hindi, English, and regional Indian languages.
Capture phone keypad responses (0 to 9) to run automated opinion surveys, opt-in confirmations, or immediately bridge the listener to a human support agent.
Maximize campaign listenership with configurable automatic retries for numbers that were busy, unanswered, or switched-off on the first attempt.
Trigger automated OTP voice calls, appointment reminders, and transactional alerts directly from your website, CRM, or billing software with sub-second latency.
Strict compliance with TRAI regulations. Real-time national DND scrubbing filters promotional batches, while verified 140-series caller headers ensure legitimate telemarketing delivery.
Why leading Indian banking, political, and consumer brands prioritize voice broadcasts over traditional call centers and text channels.
| Capability / Metric | SMSINDIAHUB Voice Call (OBD) | Manual Call Center Agents | Promotional Bulk SMS | WhatsApp Business Messaging |
|---|---|---|---|---|
| Broadcast Speed (10,000 Contacts) | < 15 Minutes (10k concurrent ports) | 3 to 5 Days (Agent capacity limit) | 5 – 10 Minutes | 10 – 20 Minutes (Tier-limited) |
| Literacy & Language Barrier | Zero (Native audio in regional tongue) | Moderate (Agent dialect constraints) | High (Requires reading literacy) | High (Requires smartphone & reading) |
| Basic Feature Phone Compatibility | 100% (Any mobile or landline) | 100% (Any handset) | 100% (Standard SMS) | 0% (Smartphones only) |
| Two-Way Interactivity | Instant DTMF Keypad (Press 1 / 2) | Full Human Conversation | Very Low (Link click CTR < 2%) | Interactive Buttons |
| Cost per Connected Outreach | ₹0.25 to ₹0.37 / 30s Pulse | ₹15.00 – ₹35.00 per agent call | ₹0.12 – ₹0.18 per SMS | ₹0.80 – ₹1.20 per template |
| Billing Transparency | Connected / Answered Calls Only | Fixed Salaries Regardless of Reach | Billed on Submission | Billed on Delivery |
See how leading Indian enterprises across BFSI, E-Commerce, Healthcare, and Education automate outbound calling to improve conversions and reduce operational costs.
Deliver personalized audio reminders with dynamic loan amounts and due dates. Callers press 1 to instantly receive a payment UPI link via SMS/WhatsApp, improving payment collection by up to 35%.
Automatically dial shoppers seconds after placing a Cash-on-Delivery order. Customers press 1 to confirm or 2 to cancel, drastically eliminating fake orders and saving forward & reverse logistics costs.
Broadcast automated voice alerts reminding patients of upcoming doctor appointments, dialysis visits, or diagnostic test readiness in regional languages, freeing up clinic staff.
Inform parents instantly about student absences, upcoming term fee deadlines, exam dates, or sudden school closures during bad weather through high-priority voice broadcasts that work on all basic handsets.
Broadcast promotional audio clips announcing new property launches or periodic car servicing due dates. Interested buyers press 1 to immediately bridge the call to an available sales executive.
Transmit candidate speeches, polling booth directions, public health announcements, or utility maintenance schedules to lakhs of citizens concurrently with 100% TRAI telemarketing compliance.
Our cloud telephony specialists will configure custom IVR branching, CRM webhooks, multi-level DTMF inputs, and dedicated caller IDs tailored to your operational requirements.
Transparent answers regarding pricing, 30-sec pulse accounting, TRAI regulations, and API integration.
Connect with millions of customers simultaneously. Deliver crystal-clear voice broadcasts, capture DTMF feedback, and enjoy 99.95% telecom uptime.
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