AI calling software in India: how AI voice agents make and take calls
AI calling software connects a telephony line to a speech-to-text engine, a language model, and a text-to-speech voice, so an AI agent can hold a real phone conversation — answering inbound calls or making outbound ones. In India it runs over Exotel, Plivo, Twilio or your own SIP trunk, supports Indian languages, and costs a platform fee plus per-minute telephony charges.
- An AI voice agent has four parts: telephony connection, speech-to-text, an LLM brain, and text-to-speech — all working in real time.
- Inbound and outbound call minutes are billed by your telephony provider at its own rates; check its current price list for incoming charges.
- Indian voices (Sarvam, Smallest.ai, ElevenLabs) support Hindi and regional languages, including natural Hinglish code-mixing.
- You can go live with an inbound AI receptionist in under a day using a ready flow and a rented or ported number.
- TRAI's DND rules and calling-hour restrictions apply to AI calls exactly as they do to human agents.
What AI calling software actually does
AI calling software lets a computer hold a phone conversation that sounds close to a human agent. Four components work together in real time: a telephony connection (the actual phone line), speech-to-text (converting the caller's voice into text), an LLM (deciding what to say next, using a system prompt and knowledge base), and text-to-speech (turning the reply back into a voice the caller hears). See our plain-English breakdown of speech-to-text and text-to-speech if you want the mechanics.
This is different from a traditional IVR, which only understands button presses, an AI voice agent vs IVR comparison covers how the caller experience changes. The gap that used to sit between the four components, the awkward pause while a caller waits for a reply, is what most vendors quietly optimise for; see why latency matters for what actually affects how natural a call feels.
Inbound vs outbound, and closed vs BYOK
| Inbound AI calling | Outbound AI calling | |
|---|---|---|
| Typical use | Answer overflow calls, act as receptionist | Appointment confirmations, EMI reminders, surveys |
| Cost pattern in India | Depends on your telephony provider and plan | Per-minute charge from telephony provider |
| Compliance | Answer promptly, identify as automated if asked | Respect TRAI DND registry and permitted calling hours |
Most businesses start with inbound, an AI receptionist for overflow calls or AI receptionist for a small business, before adding outbound campaigns like EMI reminders once they're confident in the flow.
| Model | How it works | Trade-off |
|---|---|---|
| Closed/proprietary voice app | One bundled telephony + AI + voice stack, fixed choices | Simple to start, but you can't swap a slow or expensive component |
| BYOK calling stack (Convo360's model) | You choose your telephony provider, AI model and voice independently | More setup choices upfront, full control over cost and quality per component |
A BYOK approach means if your telephony provider's outbound rate is high for a particular circle, you can switch providers without switching your entire chatbot platform, agent prompts or call history.
Telephony, voices and languages
Convo360 connects calls through Exotel, Plivo, Twilio or your own SIP trunk, you choose based on your existing telecom relationships and coverage needs; see choosing a telephony provider. Voices come from Sarvam (India-native, tuned for Indian languages), Smallest.ai, ElevenLabs or OpenAI, covering Hindi, Bengali, Tamil, Telugu, Marathi, Gujarati, Kannada, Malayalam, Odia, Punjabi and more, alongside English, including natural Hinglish. See comparing Indian voice providers and AI voice for regional languages.
Voice cloning from 1–2 minutes of audio is also available if you want the agent to sound like a specific voice on your team, see how to clone your voice for AI calls. The LLM brain can run on OpenAI, Anthropic Claude, or Google Gemini, and Gemini Live can power the voice call directly without needing a separate OpenAI key, covered in Gemini Live voice agents.
Setting up an AI voice agent on Convo360
- Connect a telephony account (Exotel, Plivo, Twilio) or your SIP trunk under Voice settings.
- Create an AI agent, write a system prompt describing its role, and set the voice/language.
- Build the call flow using voice blocks: gather (listen for a response), DTMF menu (fallback button presses), transfer (to a human), play audio, voicemail.
- Test with Preview / Try-it before going live, and check Flow Logs after your first real calls.
- For outbound, set up a calling campaign with your contact list and calling-hours window.
Full documentation is in Voice docs and how to set up an AI voice agent. For outbound campaigns specifically, see how to run an outbound AI calling campaign.
Cost and compliance basics
You pay a Convo360 platform fee (AI voice calls are included from the Pro plan, ₹2,999/month ex-GST) plus telephony minutes billed directly by your provider, no markup added by Convo360 since minutes are BYOK. Incoming and outgoing call charges depend on your telephony provider and plan, so check the provider's current price list; minutes are paid directly to the telephony provider. See AI voice agent cost per minute for a worked breakdown.
On compliance: outbound calling must respect the TRAI DND registry and permitted calling windows, and the AI should never ask for OTPs, full card numbers or passwords. See AI calling compliance in India and Compliance docs, plus TRAI's official site for the current DND rules.
Common mistakes to avoid
- No fallback to a human: always include a transfer block for callers who ask for a person, especially for complaints.
- No DTMF fallback: a caller in a noisy market or on a bad line needs a button-press option when speech recognition struggles, see DTMF vs speech input.
- Skipping call recordings review: listen to your first week of real calls and refine the system prompt based on what actually confuses the AI, see call recordings and transcripts.
- Ignoring voicemail detection: outbound campaigns waste minutes and annoy people if the AI talks to an answering machine as if it were a person, see voicemail detection.
- Calling outside permitted hours: even a well-built flow is a compliance risk if the campaign schedule ignores TRAI's calling-hour rules.
Deciding if AI calling fits your business
AI calling software makes the most sense where call volume is high, repetitive and time-sensitive, appointment confirmations, delivery updates, EMI reminders, admission enquiries during exam season. It makes less sense as a full replacement for a relationship-driven sales call where tone and negotiation matter more than information delivery.
A practical starting point: track how many calls your front desk or support line misses in a typical week, and what those callers were asking for. If most of it is repeatable, "what are your timings", "where is my order", "can I reschedule", an AI receptionist pays for itself quickly. See the cost of missed calls for a small business for how to estimate this before you commit to a plan.
Most Indian businesses get the best results running AI calling and WhatsApp automation together rather than picking one. A missed inbound call can trigger a WhatsApp follow-up with a booking link; an outbound reminder call that goes unanswered can fall back to a WhatsApp message instead. See outbound AI calls vs WhatsApp follow-up and AI voice calls over WhatsApp, an early feature that lets the same AI agent handle a voice call inside WhatsApp itself, without a separate phone number. Since both channels sit in the same Flow Builder and workspace on Convo360, a single AI agent's knowledge base and system prompt can power chat replies and phone calls consistently, so a customer gets the same answer whether they type or call.
Example conversation
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Frequently asked questions
What telephony providers work with AI calling software in India?
Convo360 connects to Exotel, Plivo, Twilio, or your own SIP trunk, so you can use an existing telecom relationship or pick a new one based on coverage and pricing.
Does AI calling software support Hindi and regional Indian languages?
Yes. Voices from Sarvam, Smallest.ai, ElevenLabs and OpenAI cover Hindi and most major Indian languages, including natural Hinglish code-mixing, for a more conversational feel than a stock English-only voice.
How much does an AI voice agent cost per call in India?
Cost depends on call duration and your telephony provider's per-minute rate, since Convo360 adds no markup on minutes. Incoming call charges depend on your provider and plan, so check its current price list; all minutes are billed directly by the provider.
Can an AI voice agent transfer a call to a human?
Yes, the transfer voice block routes the caller to a live team member at any point in the flow, which is useful for complex requests the AI shouldn't handle alone.
Is outbound AI calling legal in India?
Yes, provided you respect the TRAI DND registry, permitted calling hours, and obtain appropriate consent — the same rules that apply to human telecalling apply to AI-driven outbound calls.
Can I clone a voice for my AI calling agent?
Yes, voice cloning from 1–2 minutes of sample audio is available, letting the AI agent speak in a specific chosen voice rather than a generic one.
Related reading
Available across India — see WhatsApp & AI calling automation by state and city.