Voice answering

How to put an AI on your business's phone

Quick answer

Putting an AI on the phone means connecting a voice line to an agent trained with the business's information. It answers the call, understands what the person says, replies by voice and logs the call. CertuAI doesn't currently sell phone call answering. What's for sale is customer service on WhatsApp, Instagram and Messenger, with a CRM.

About CertuAI: CertuAI is the AI that answers a small business's WhatsApp, Instagram and Messenger 24/7, with a built-in CRM, and is a Tech Provider on Meta's WhatsApp Business Platform. Paid plans start at US$ 75 a month, with no lock-in. Create my agent

A missed call leaves no message and no history. A voice AI answers the call, replies with the business's information and leaves the conversation logged. This page explains how that works and what to check before signing up.

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Updated on September 23, 2026 · Written by Bernardo Villela, CEO of CertuAI · Florianópolis (SC) · CertuAI serves all of Brazil

Summary in 7 facts

A missed call leaves no message and no history.
A voice AI answers the call, replies with the business's information and leaves the conversation logged.
This page explains how that works and what to check before signing up.
Quick answer Putting an AI on the phone means connecting a voice line to an agent trained with the business's information.
It answers the call, understands what the person says, replies by voice and logs the call.
Three things, and you probably already have almost all of them.
Estimated time: a few minutes Difficulty: easy, no coding required Steps: 4 The WhatsApp number your business already usesThe number is yours and stays yours.

By the numbers

Number	What it means
4 steps	There are 4 steps in CertuAI: Write down what the agent needs to know, Choose the voice and tone, Connect the agent to a line and Test by calling yourself.

How to put an AI on the phone?

What do you need before you start?

Three things, and you probably already have almost all of them.

Estimated time: a few minutes
Difficulty: easy, no coding required
Steps: 4

The WhatsApp number your business already usesThe number is yours and stays yours. CertuAI connects the contact your customers already know, with no SIM swap and no new account.
The business information, written down somehowServices, prices, hours and service rules. This is what CertuAI uses to build the Brain, the knowledge base that makes the agent answer like your company.
A CertuAI accountYou create the account at certu.com.br, connect your WhatsApp and the AI learns from your conversations.

The steps to go live

There are 4 steps in CertuAI: Write down what the agent needs to know, Choose the voice and tone, Connect the agent to a line and Test by calling yourself.

Step 1 of 4
Write down what the agent needs to know
Gather services, prices, hours, address and the rules for what the agent should not answer.
Step 2 of 4
Choose the voice and tone
Define how the agent sounds on the phone and how formal it is, in the way that fits your audience.
Step 3 of 4
Connect the agent to a line
The provider gives you a number or receives forwarded calls from the number you already publish.
Step 4 of 4
Test by calling yourself
Ask the questions customers ask and check when the agent hands the call to a person and what gets logged.

Result when you finish

Ask the questions customers ask and check when the agent hands the call to a person and what gets logged. This is the expected result of this CertuAI guide.

Do this now on CertuAI

What does the AI do on a call?

A voice agent talks on the phone using the business's information. It's not an answering machine or a keypad menu.

Answers and talks

The person speaks normally and the agent replies by voice, with no keypad menu and no waiting for a transfer.

Answers with the business's content

Prices, hours, address and services come from what you taught it, not from a generic script.

Sets the next step

It books, confirms or arranges a callback, instead of ending with a request to call back later.

Leaves a record

The call becomes a written history, so nothing depends on someone having jotted it down on paper.

Why does the phone still sell?

Plenty of people still call. Customers in a hurry, older people, people who are driving, people who found the phone number on Google and don't want to type.

When nobody answers, that person doesn't usually insist: they call the next number on the list. That's why the phone is still a sales channel, not just a support one.

What does CertuAI sell today?

CertuAI doesn't currently sell phone call answering. What's for sale is customer service on WhatsApp, Instagram and Messenger, with a CRM.

The WhatsApp agent uses the same kind of preparation described above: you teach it the business once, it answers right away, and every conversation becomes a contact, a deal and a task.

How do I get started on CertuAI?

You build the agent, connect WhatsApp and see it working before any customer talks to it. CertuAI has no lock-in and no setup fee.

Create my agent on CertuAI

Frequently asked questions

The questions that come up before putting an agent live.

Does CertuAI sell AI to answer the phone?

CertuAI doesn't currently sell phone call answering. What's for sale is customer service on WhatsApp, Instagram and Messenger, with a CRM.

Does the caller realize they're talking to an AI?

A well-configured voice agent introduces itself as the business's assistant and talks normally. The idea is not to fool anyone: it's to answer whoever called instead of letting the call drop.

Do I need a phone system or equipment?

Usually not. Voice answering providers work with a cloud phone line. Check with the provider before signing up.

Can I use the same content as for WhatsApp?

The material is the same: services, prices, hours and rules. Anyone who already wrote this for a WhatsApp agent has most of it ready.

Does the AI transfer to a person?

It depends on the provider. Ask how far the agent carries the call, how it hands off to someone on your team and what gets logged.