How to Choose an AI Voice Agent in India: A Buyer's Checklist

The short answer

Pick the agent that does well on the tests that match your calls. For most Indian businesses that means spoken quality in the language your customers actually use, a response delay that does not feel like a bad phone line, calling that is compliant by design, a price you can forecast, and a trial that lets you hear real calls before you pay anything meaningful.

The sections below take each test in turn: what it is, how to run it in an afternoon, and what a good result looks like. A scoring table at the end turns the answers into a decision.

1. Languages and code-switching

India does not speak one language, and customers rarely speak one at a time. A caller in Hyderabad says a Telugu sentence with English nouns in it. A caller in Pune moves between Marathi and English in a single breath. This is code-switching, and it is where many generic, English-first voice agents fall down.

Do not accept a language list as the answer. Ask the vendor to call your phone and then run these checks yourself.

• —Speak naturally in your language with English product names, numbers and place names mixed in. Does the agent follow, or does it ask you to repeat?
• —Switch to English mid-sentence. Does it follow in the same voice?
• —Use a regional accent, a noisy room or a bad mobile signal. Does it still understand?
• —Ask a question with a number, a date and a locality. Does it read them back correctly, in the right language?
• —Check that the language count is real: a line such as 40 languages means little if the one you need is a weak one.

Fair comparison matters here. Some vendors list more languages than Outpero: Gnani names nine Indian languages including Bengali, Gujarati and Punjabi, and Ozonetel's Voice AI page claims 12 or more. Outpero is a specialist in seven languages, Hindi, Telugu, Tamil, Marathi, Kannada, Malayalam and Indian English, with code-switching in each (Hinglish, Tenglish, Tanglish, Kanglish, Manglish and Marathi-English). If you need Bengali or Gujarati, Outpero is not the right choice today. If your customers speak the six regional languages above, depth in those matters more than breadth.

2. Latency: run a stopwatch test

Latency is the pause between the caller finishing a sentence and the agent starting to reply. Past about a second or two, a conversation feels laboured: callers repeat themselves, talk over the agent or hang up.

Vendors measure latency differently. Some quote the speed of the language model alone, some quote speech-to-speech time on a good network, and some quote end to end including telephony. Bland's documentation claims sub-400 ms response latency and Exotel claims sub-300 ms voice latency; both are the vendors' own figures and the definitions differ. Outpero's end-to-end latency, from the caller stopping to the agent speaking, is 0.8 to 1.3 seconds on average.

1. 01Call the demo number from a normal mobile phone, not from the vendor's web widget.
2. 02Ask ten short questions and time the gap after each with a stopwatch or a screen recording.
3. 03Repeat in a car, on a crowded street or on a 4G signal with one bar.
4. 04Interrupt the agent mid-sentence. A good agent stops talking and listens; a poor one carries on.
5. 05Record all of it and compare vendors on the same ten questions.

Treat quoted millisecond numbers as marketing until you have heard the call. The stopwatch result on your own phone is the only figure that counts.

3. Inbound, outbound and broadcast

Decide which jobs you are buying for, because vendors specialise.

Outpero offers all four modes, with call transfer to your team and caller memory. Telephony-led vendors such as Exotel, Ozonetel, Knowlarity and MyOperator are stronger if you need a full contact-centre stack, IVR, toll-free numbers or dialers for a human team; their published pages list those, and Outpero does not provide them. Platforms such as Bland and Synthflow are stronger for large enterprise rollouts, with compliance certifications and integration breadth Outpero does not match.

4. Pricing transparency

Ask for the all-in monthly cost at your volume, in writing, with GST. The usual hiding places are setup fees, minimum commitments, number rental, concurrency charges and per-feature add-ons.

• —Is there a setup fee or a monthly subscription?
• —What is the per-minute rate, and does it differ by language or voice?
• —How are minutes counted: connected time only, or ringing time too? Are unanswered calls billed?
• —What does the phone number cost, and does it include the carrier and compliance fees?
• —How is concurrency sold? How many calls can run at once at your price?
• —Do the prices include or exclude 18 percent GST?

For reference, Outpero charges no setup fee and no subscription: Standard ₹5 or Premium ₹6.8 per connected minute from prepaid credits that never expire, the same in every language, with 50 free credits and no card at signup. A +91 business number is ₹649 a month including 1 channel (one call at a time), and each extra channel is ₹649 a month. Prices exclude 18 percent GST and unanswered calls are not billed.

Flat plans can win at scale. Vomyra sells flat monthly calling plans from ₹19,999 that stop minute-counting, which on its own page works out cheaper than a per-minute rate beyond roughly 4,000 minutes a month at ₹5. SquadStack says it is typically priced between ₹2 and ₹5 a minute. Run your own volume through each model before deciding.

5. DLT, DND and TRAI

Outbound commercial calling in India runs under TRAI's regulations, with DLT registration for the calling entity and a DND (Do Not Disturb) registry that bulk campaigns are expected to screen against. Telecom operators block non-compliant traffic, so a platform that ignores this simply has calls that do not connect.

• —Is the calling line DLT-registered, and who handled the registration: the vendor or you?
• —Does the platform screen bulk lists against DND automatically?
• —Can you set calling windows so calls go out only in permitted hours?
• —What is the process when a person says do not call me again?
• —Is the use case you plan (enquiry callback, reminders, cold list) clearly separated in the vendor's guidance?

Outpero calls from a DLT-registered line, screens bulk campaigns against DND and honours calling windows. This is not legal advice: whether your specific list counts as cold outreach or an existing relationship depends on details. Confirm with your own compliance advisor, and read the plain-language guide linked below.

6. Integrations

List the three systems the agent must touch: where leads come from, where bookings go and where results are recorded. Then test them in the trial rather than trusting a logo wall.

• —Lead sources: Meta lead ads, Google Ads forms, website forms, IndiaMART, JustDial, property portals. Native, via Zapier or Make, or by webhook only?
• —Calendar: does the agent book a real slot, and can it read availability live?
• —Spreadsheet or CRM: can it read and write a sheet, call a custom API or send results to your webhook?
• —WhatsApp: can it send a message during or right after the call?
• —Human handover: can a call be transferred to your team?

Outpero connects through webhooks, Zapier and Make, reads and writes spreadsheets, books calendar slots, calls custom APIs, sends WhatsApp messages and can transfer to your team. Synthflow lists 200 or more integrations including Salesforce and HubSpot; Yellow.ai lists 150 or more enterprise connectors. If you live inside a large enterprise CRM, those lists may serve you better.

7. Data, recordings and the DPDP Act

Voice calls produce personal data: names, numbers, recordings and transcripts. India's Digital Personal Data Protection Act, 2023 puts obligations on those who decide why and how that data is processed, which usually means you, the business, with the vendor acting as a processor. The detail of the rules is still evolving, so ask for answers in writing rather than assuming.

• —Where are recordings and transcripts stored, and for how long? Can you delete them on request?
• —Can you export every call, transcript and field, for example as CSV?
• —Who can access recordings inside the vendor's company, and what are the controls?
• —How is a caller's consent or notice handled when a call is recorded?
• —What certifications does the vendor hold, and what does it not hold? Bland, Synthflow, Gnani and Yellow.ai publish SOC 2, ISO or HIPAA listings; if you are a bank, a hospital group or a regulated enterprise, that matters, and Outpero is not the right fit for a requirement of that kind today.

Outpero provides recordings, full transcripts, summaries, sentiment and your custom fields in the dashboard, with CSV export and webhooks. Ask any vendor, Outpero included, for data-handling terms before a production rollout.

8. The trial

A good trial is a small version of the real job. Use real numbers from your business, real scripts and your own customers' language.

1. 01Sign up and get a working agent without a sales call. If you cannot, note the friction.
2. 02Write the job in plain words, including the questions the agent must ask and what it must never promise.
3. 03Call it yourself ten times, including awkward cases: a wrong number, an angry caller, a request for a person.
4. 04Run twenty to fifty real calls to willing contacts or past customers.
5. 05Listen to recordings and read transcripts. Check that the outcomes and fields were captured correctly.
6. 06Check the cost per call on the log against the quoted rate.

Outpero is self-serve at app.outpero.com, with 50 free credits at signup and no card required, so a first test costs nothing. Compare that with vendors that start with a demo call and a proposal, which can suit a complex enterprise deployment better.

A weighted scoring table

Score each vendor from 1 to 5 on every row, multiply by the weight, and add. Change the weights to fit your business: a bank might double compliance, a clinic chain might double languages.

A total above about 400 out of 500 on your weights is a strong candidate. More useful than the total is the pattern: a vendor that scores 1 on a criterion you weighted heavily is out, however good the rest looks.

Which kind of vendor suits which buyer

Every one of these categories includes good products. The question is fit, not rank. Shortlist two or three, run the same eight tests, and decide on evidence.

Frequently asked questions