AI phone answering for small businesses: how it works and costs

A restaurant packed at lunch, a salon where everyone's hands are busy, a practice that closes at 5: in all three, the phone rings when nobody can answer. An AI phone assistant picks up exactly those calls. Here's what it can do, where it falls short, what it costs in 2026 and which rules apply.

How it works

An AI phone assistant connects three things in real time:

1. Speech recognition turns what the caller says into text.
2. An AI model (from OpenAI, Anthropic, Google or others) understands the request and decides how to reply, based on the information you've given it: hours, menu, services, policies.
3. Speech synthesis reads the reply in a natural voice.

The difference from a classic phone tree ("press 1 for...") is that people talk normally, and the assistant can do things, not just answer: check a calendar, make a booking, send a confirmation text. It's a specific kind of AI agent.

What it does well

It works best on short, predictable calls where most questions have the same answer. If 80% of your calls are "what time do you close?" and "do you have a table for four tonight?", an assistant can take most of them.

Where it falls short

• Complex or sensitive requests: a complaint, a medical issue, a price negotiation. These need a person.
• Noise and bad connections: speech recognition makes more mistakes in a car, on the street or on a poor line.
• Information it doesn't have: if you haven't told it the price of a service, a badly configured assistant may make one up. That's why it should stick strictly to what it's been given and say "let me transfer you to a colleague" when it doesn't know.
• People who don't want to talk to a machine: there should always be a way to reach a person.

What it costs

There are two parts: building it and the minutes of conversation. Platform prices as of October 2026:

At Retell, the per-minute price is made up of voice infrastructure ($0.055), the AI model (from under $0.01 to $0.16, depending on the model), the voice ($0.015 for most voices) and telephony ($0.015). The spread between the low and high end comes mostly from the model and the voice.

A worked example: a business with 300 calls a month averaging 2 minutes uses 600 minutes. At $0.11–$0.15 a minute, that's roughly $66–$90 a month to run. Building it (the script, the connection to your calendar or booking system, testing with real calls) is a separate, one-time cost that depends on how much the assistant has to do, like any AI automation.

There are also ready-made AI receptionist products with a monthly fee and fixed features. They're quicker to start with; a custom setup makes sense when the assistant has to work with your own booking system, rules or several locations.

The rules

Telling callers it's an AI. For callers in the EU, Article 50 of the AI Act has applied since 2 August 2026: people must be told they're interacting with an AI system from the first contact, unless that's obvious, and on the phone it isn't. In the US, there's no single federal rule for inbound calls, but some states have bot disclosure laws, and an assistant that introduces itself avoids misleading anyone. A simple opening works: "Hi, I'm the restaurant's virtual assistant. I can help with a reservation or connect you with a colleague."

Recording and transcripts. About a dozen US states, including California, Connecticut, Florida, Maryland, Massachusetts, Montana, New Hampshire, Pennsylvania and Washington, require the consent of everyone on a call to record it. Since you can't control where callers are, the safe approach is to announce at the start that the call is recorded or transcribed.

Outbound calls are different. In February 2024, the FCC ruled that AI-generated voices count as "artificial" voices under the Telephone Consumer Protection Act, so AI calls you place to customers need the same prior consent as robocalls. Answering incoming calls isn't affected.

Health information. For a medical or dental practice, calls contain protected health information, so HIPAA requires a business associate agreement with each vendor in the chain.

How to start

1. Pick one use case: for example, only after-hours calls, or only reservations.
2. Write the list of questions and answers you get most often, with exact information.
3. Decide when it hands off to a person and what it does if nobody answers.
4. Start with forwarding: your phone rings at the business first and goes to the assistant only if nobody answers within a few rings.
5. Read the transcripts for the first few weeks and correct what it got wrong.

If your customers text more than they call, a WhatsApp chatbot may be a simpler start.

Companies building voice agents in Romania, compared: Best AI voice agent companies in Romania.

We build phone assistants connected to the calendar, booking system or email you already use, with handoff to a person and an AI disclosure in the first sentence. The details are on our AI automation page.