Bulk voice call
Bulk voice calls that listen and reply.
A bulk voice call campaign usually means one recorded message played to a long list. VocalLabs runs the same scale with an AI voice agent instead: every call is a two-way conversation in the listener’s language that uses their own details, answers their questions and records what they said.
Between March and June, Bengaluru West City Corporation used it to make 4,54,908 property-tax calls in Kannada across 64 wards. 26,962 property owners committed to clearing dues of ₹35.11 crore.
4,54,908 calls · 64 wards · Kannada · 20+ languages · WhatsApp & DLT-registered SMS follow-up · CERT-In · ISO 27001:2022
- AI agent00:00
Namaste. This is the AI assistant from Suraksha Health Insurance. Am I speaking with Mr. Rakesh Verma?
- Caller00:05
Yes, speaking.
- AI agent00:07
Your family health policy is due for renewal on 30 November. The premium is ₹18,400. Shall I send the payment link on WhatsApp?
- Caller00:15
Will my mother still be covered? She turned 61 this year.
- AI agent00:20
Yes. Renewal keeps the same members on the policy. I am sending the link now; you can pay by UPI or card.
- System00:27
WhatsApp payment link sent · intent: will renew · CRM updated
4,54,908 calls in one tax cycle: Bengaluru West.
Bengaluru West City Corporation needed to reach property owners with pending tax across 64 wards. A VocalLabs AI voice agent called them twice a day in Kannada, told each owner their exact dues and how long they had been pending, and walked them through paying online.
- Calls made
- 4.54 lakh
4,54,908 automated calls, between March and June.
- Property owners reached
- 59,600+
Spoken to in Kannada about their own dues.
- Owners committed to pay
- 26,962
Agreed to clear their pending tax after speaking to the AI agent.
- Dues committed
- ₹35.11 cr
Outstanding tax linked to those commitments.
Figures as reported by the corporation to the press, September and October 2026. · Source: The Bengaluru Live
From calls to commitments.
Calls were repeated twice a day, so the call count runs well ahead of the people reached: about 7.6 calls for every owner reached. Of the owners reached, about 45% committed to pay.
- Calls made
- 4,54,908
- Property owners reached
- 59,600+
- Owners who committed to pay
- 26,962
Reported figures, March to June. The ratios in the text are arithmetic on them. · Source: Asianet Newsable
Voice broadcasting, or a call bot that talks back.
Voice broadcasting plays a recording. It suits a one-line alert. When the listener has a question, needs to hear their own amount, or has to agree to something, a recording is not enough.
| Voice broadcasting | Press-1 IVR blast | Two-way AI call | |
|---|---|---|---|
| What the listener hears | The same recording for everyone | A recording, then a keypad menu | Their own details: name, amount, due date |
| Can they ask a question | No | Only the options on the menu | Yes, answered from your information |
| Languages | One per recording | One per recording | 20+ languages, switching mid-sentence |
| What you learn | Delivered or not | Which key was pressed | What they said: intent, reason, commitment, callback time |
| Next step on the call | None | Transfer to an agent, if staffed | Payment link on WhatsApp or SMS, a booking, or a warm transfer |
| Suited to | One-line alerts and announcements | Simple yes or no confirmations | Reminders, collections, renewals, surveys, verification |
Category-level comparison. Individual services vary.
How a bulk AI calling campaign runs.
One list goes in. Every number gets a conversation with its own details, and every reply comes back as data your team can act on.
- 01Upload the listCSV or API: name, number, language, amount, due date
- 02Agent callsIn the listener’s language, inside the hours you set
- 03ConversationTheir own details, questions answered, objections heard
- 04Outcome capturedCommitted, callback, dispute, wrong number, opt-out
- 05Follow-upPayment link on WhatsApp or DLT-registered SMS
- Personal at scale
- Each call uses that person’s own details, so a lakh calls are a lakh different conversations.
- Thousands at once
- Thousands of concurrent calls, auto-scaled. Nothing to provision before a campaign.
- Every reply recorded
- Outcomes and transcripts reach your CRM or arrive by webhook, so field teams can concentrate on the hard cases.
- Payment in the same breath
- Payment links from Razorpay, PayU or Cashfree, sent on WhatsApp or SMS while the call is fresh.
What Indian organisations run as bulk voice campaigns.
- 01Civic
Tax and utility dues
Reminders with each person’s amount, how long it has been pending, and how to pay online.
- 02Collections
EMI reminders
Due-date reminders with a UPI link, and the reason for any delay recorded per account.
- 03Insurance
Policy renewals
Renewal reminders that answer cover questions and send the payment link.
- 04Commerce
COD and order confirmation
Confirm cash-on-delivery orders and addresses before dispatch.
- 05Education
Admissions
Call applicants, answer fee and date questions, and book a counselling slot.
- 06Research
Surveys and feedback
A few questions in the listener’s language, with answers stored as fields, not audio.
TRAI calling rules for bulk voice calls.
Which number series you call from depends on who you are and why you are calling. This is a summary, not legal advice.
| What TRAI has mandated | What it means for your campaign | |
|---|---|---|
| Promotional calls | Promotional calls from entities in any sector use 140-series numbers. Callers must register with their telecom service provider under the TCCCPR. | Run promotional campaigns from 140-series numbers registered to you. VocalLabs connects to your telephony over SIP trunks or cloud numbers. |
| Service and transaction calls | Entities regulated by RBI, SEBI, IRDAI and PFRDA use 1600-series numbers for service and transaction calls to existing customers. Government bodies use them for citizen communication. | If you are a regulated entity, service and transaction campaigns use your 1600-series numbers. |
| DND preferences | People can block promotional calls by sector on the DND registry. A blocked sector receives no 140-series calls. | Numbers are checked against your suppression list and the national registry before dialling. A spoken opt-out is honoured in every future campaign. |
Summary of TRAI Press Release No. 91/2026, 10 July 2026. Not legal advice. · Source: TRAI Press Release No. 91/2026
Launch a bulk voice call campaign in four steps.
- 01
Share the list and the goal
Names, numbers, preferred language and the details each call needs, such as amount and due date. One goal per campaign: pay, renew, confirm or book.
- 02
Write the conversation
What the agent says, the questions it can answer, what it must never say, and when to hand over to your team.
- 03
Set numbers and hours
Your registered numbers or SIP trunk, calling hours, retries for unanswered calls, and follow-ups on WhatsApp or DLT-registered SMS.
- 04
Pilot, then scale
Call a small batch, listen to the recordings and adjust. Then release the full list; the platform scales to thousands of concurrent calls.
Questions buyers ask first.
One list. Every call a conversation.
Tell us who you need to reach, in which languages, and what you need them to do. We will build the agent, run a pilot batch with you listening, and then scale to the full list.
