Bulk Voice SMS & Voice Broadcasting Service — Automated Voice Calls at Scale
Broadcast pre-recorded or text-to-speech voice calls to thousands of contacts at once — smart retry, custom caller ID, DTMF Press-1 and real-time reports. Reach customers in 22+ languages across India and 190+ countries, billed on a pay-per-connect pulse model.
What is bulk voice SMS?
Bulk voice SMS is an automated pre-recorded or text-to-speech (TTS) phone call delivered to thousands of recipients at once. Instead of a text message, each contact receives an outbound voice call that plays your message — ideal when you need attention, reach people who don’t read texts, or communicate in a spoken regional language.
It is also known as voice broadcasting, OBD (outbound dialing) or voice call blast. Unlike text bulk SMS, voice campaigns can be personalized with dynamic TTS, capture keypad responses via DTMF (Press-1) and route interested callers to an agent — all billed on a pay-per-connect pulse model so you only pay for answered calls.
How bulk voice SMS works
Upload contacts
Import your number list from Excel/CSV or push contacts through the API.
Record or type message
Upload an MP3/WAV recording or type text and let TTS voice it in 22+ languages.
Schedule & set retry
Pick a send window, set smart-retry attempts and choose your caller ID (CLI).
Launch & track
Fire the broadcast and watch live reports — connects, DTMF and durations.
Voice broadcasting features
Pre-recorded MP3/WAV
Upload professional voice recordings for a consistent, human-sounding message.
Text-to-speech (22+ languages)
Type your message and convert it to lifelike speech in 22+ Indian and global languages.
High concurrent throughput
Thousands of parallel channels dial thousands of calls per minute at peak.
DTMF & IVR Press-1
Capture keypad input, run interactive menus and connect interested callers to agents.
Scheduling & throttling
Queue campaigns for future slots and control the dial rate to match your capacity.
Smart retry
Automatically re-attempt busy, unanswered or failed calls up to a configurable limit.
Real-time reports
Live dashboards for attempts, connects, DTMF, duration and retries — exportable.
Custom caller ID (CLI)
Display your registered number as the caller line identity to build trust and pickups.
DND/DNC filtering
Real-time scrubbing against DND/DNC lists keeps promotional campaigns compliant.
API & CRM integration
Trigger voice calls from your CRM, app or workflow via a simple REST API and webhooks.
Voice SMS vs text SMS
Voice and text each win in different situations — pick the channel that fits your message and audience.
| Dimension | Voice SMS / Broadcasting | Text SMS |
|---|---|---|
| Format | Pre-recorded or TTS audio call | Written text message (160 chars) |
| Best for | Alerts, reminders, surveys, awareness drives | OTPs, links, confirmations, short offers |
| Interactivity | DTMF keypad input & Press-1 to connect | One-way (or reply keyword via two-way) |
| Language reach | Spoken in 22+ languages via TTS | Unicode text in regional scripts |
| Attention | High — a ringing phone demands action | Depends on the recipient reading it |
| Personalization | Dynamic TTS with variable data | Merge fields in the text body |
| Billing model | Pay-per-connect (pulse, e.g. 15 sec) | Per message submitted |
| Compliance | TRAI/DLT, DND/DNC, 9 AM–9 PM for promo | TRAI/DLT header & template rules |
Prefer written messages? Explore bulk SMS gateway and transactional SMS.
Transactional vs promotional voice SMS
Transactional voice SMS carries essential, user-triggered information — OTP confirmations, delivery alerts, payment reminders and service notifications — and can be delivered 24×7 to registered recipients. Promotional voice SMS broadcasts marketing and awareness messages to an opt-in audience, is filtered against DND/DNC lists and is delivered only within the permitted 9 AM–9 PM window. Choosing the right category keeps your campaigns compliant and deliverable.
Use cases by industry
BFSI & collections
EMI and payment reminders, KYC callbacks and secure account alerts at scale.
E-commerce & logistics
Order confirmations, out-for-delivery calls and COD verification via Press-1.
Healthcare
Appointment reminders, report-ready alerts and vaccination or camp notifications.
Education
Admission drives, fee reminders, results and demo-class invitations by voice.
Political, govt & NGO
Awareness campaigns, voter outreach and community announcements in local languages.
Real estate
New-launch invites, site-visit follow-ups and price-drop alerts with agent connect.
Compliance — TRAI, DLT & DND
Voice broadcasting in India follows TRAI’s TCCCPR rules. We build compliance into every campaign so your calls connect without blocks or penalties.
1. 9 AM–9 PM window
Promotional voice calls are delivered only within the permitted daytime window; the rest is queued.
2. Registered CLI
Calls originate from a registered caller line identity for transparency and better pickups.
3. DND/DNC scrubbing
Lists are scrubbed against DND/DNC registries in real time before dialing promotional traffic.
4. Transactional vs promotional
Transactional/opt-in calls reach registered users 24×7; promotional needs explicit consent.
Need essential alerts around the clock? See transactional voice SMS.
A voice broadcasting partner built for scale
Trusted by 5,000+ businesses across India and 190+ countries, with 15+ years in messaging — direct voice routes, honest pay-per-connect billing and the reporting to prove your ROI.
Pay-per-connect billing
Pulse-based charging means you pay only for answered calls — no waste on ring-outs.
High concurrency + smart retry
Thousands of parallel channels with automatic re-dials maximize your connect rate.
22+ language TTS
Reach every audience in their spoken language with lifelike text-to-speech.
24×7 support
99.9% platform uptime backed by human support any time you need it.
Pricing
Bulk voice SMS is billed on a pay-per-connect pulse model — you are charged only for answered calls, metered in pulses (for example 15-second increments). Rates scale down with volume and vary by destination and language. Unanswered calls and ring-outs cost nothing, so your spend tracks real reach.
See current slabs on our pricing page or request a demo for a volume quote.
