The phone rings while your hands are needed on the building site, at reception or in a customer meeting. An AI phone assistant, also called an AI call assistant, takes over call handling: it answers these calls, asks about the request and passes it on in a structured form. What makes it work day to day depends less on the tool than on the setup. This guide shows when an AI phone assistant pays off, what it costs, how setup works and what to look out for on data protection.
What an AI phone assistant can do
An AI phone assistant is a voice program that answers calls and understands free-flowing speech. It greets the caller, says that it is an AI, asks for name, request and call-back number, and answers simple questions such as opening hours or service area. Depending on the provider, it books appointments in the calendar, forwards urgent calls and writes requests directly into your practice, trades or CRM software.
AI phone assistant, AI call assistant or AI phone system?
The terms are often mixed up. AI phone assistant and AI call assistant mean the same thing: a voice program that conducts the conversation itself. An AI phone system, by contrast, is a telephone system that connects, distributes and forwards calls and can offer AI functions such as transcription or call summaries.
For most small businesses, replacing the phone system is not necessary. The assistant attaches to the existing number through call forwarding and answers calls when nobody picks up. A new system only pays off when the old one is due for replacement anyway.
When an AI phone assistant pays off
- Many calls follow a few patterns: appointment request, call-back request, damage report, opening hours.
- A noticeable share of calls arrives outside business hours or when nobody can pick up.
- The team loses time on call-backs because voicemail messages are incomplete.
- Requests should land in the calendar or the industry software without retyping.
It is less suitable when most conversations need advice or callers have very different, hard-to-predict requests. A human answering service is then often the better choice, or a combination of both.
Setup in six steps
Collect the requests
For one week, note who calls, why and when. This gives you the questions the assistant should ask and the cases that belong with a person straight away.
Choose a provider
What matters is the billing model, server location, a way to test it and above all the connection to the software you already use. You can find an independent comparison of AI phone assistants (in German) with prices, data protection details and demo numbers from eight providers at ki-telefonassistent-test.de.
Set the greeting and rules
A short announcement with a notice that it is an AI, the questions in a sensible order, and clear rules for emergencies and for everything the assistant should not answer, for example prices.
Set up call forwarding
Your existing number stays. Calls go to the assistant when unanswered, when busy or outside opening hours.
Make the connections
Connect the calendar, CRM or industry software directly or through automation services such as n8n or Make, so that appointments and requests arrive without retyping.
Test and hand over
Test with real requests, including background noise and interruptions. Then give the team a short guide on who processes the summaries and how call-backs work.
What an AI phone assistant costs
Running costs depend on the provider and the call volume. According to published prices, the range for small businesses runs from a free entry plan to about €200 a month (as of November 2026). How much of that applies to you depends on the billing model:
- Per minute: Costs grow with call length. Cheap for short calls, expensive for long advisory conversations.
- Per call or per conversation: Easy to plan when calls are of similar length.
- Package or monthly price: A fixed allowance per month. Each provider handles overages differently.
An example calculation with assumed figures: with 150 calls a month averaging two minutes, that is 300 conversation minutes. At €0.30 a minute, that comes to €90 a month. With an assumed monthly flat rate of €79 including 400 minutes, it would be €79. So calculate with your own call numbers, not with the entry price. A cost calculator with the prices of seven providers (in German) does this for you.
On top of that comes the one-off setup, and depending on your plan, your telephone provider may charge fees for call forwarding. Avolang sets up AI phone assistants from €180 net, depending on integrations, and then takes over management for €20 net a month. The offer at a glance: AI phone assistant setup.
Data protection and the EU AI Act
Personal data arises on the phone, and in medical practices even health data. Before you start, clarify:
- Data processing agreement: Is a DPA in place, and which sub-processors are named?
- Server location: Where are conversations processed and stored?
- Recording: Is the conversation recorded or transcribed, for how long, and can this be switched off?
- Transparency: Callers should learn that they are speaking to an AI. The EU AI Act provides for a transparency obligation here.
This section does not replace legal advice. In practices and with sensitive data, the data protection officer should be involved from the start.
Common mistakes during setup
- Greeting too long: Callers hang up before the AI gets to the point.
- No emergency rule: Water damage or a medical emergency must not end up as a call-back request in the inbox.
- No integration: If every request has to be retyped, a large part of the benefit is lost.
- Tested only with “perfect” calls: Real callers talk over each other, have background noise and interrupt.
- Nobody is responsible: Summaries need someone who processes them promptly.
Frequently asked questions
How much does an AI phone assistant cost?
According to published prices, running costs for small businesses range from a free entry plan to about €200 a month, depending on the provider and call volume. A one-off setup fee comes on top. At Avolang, setup starts at €180 net and management afterwards costs €20 net a month.
Is there a free AI phone assistant?
Yes, some providers offer a free entry plan, usually with a limited allowance. That is enough for testing. For permanent use, the data processing agreement, server location and retention period should be settled.
What is the difference between an AI phone assistant and an AI phone system?
An AI phone assistant conducts the conversation itself: it answers calls, asks about the request and passes it on. An AI phone system connects and distributes calls and offers AI functions such as transcription or summaries.
Do I have to replace my phone system for this?
Usually not. The assistant attaches to your existing number through call forwarding and answers calls when nobody picks up or outside opening hours.
Can an AI phone assistant be used in line with the GDPR?
Yes, provided a data processing agreement is in place, the server location and retention period are settled, callers are told at the start that they are speaking to an AI, and calls are recorded only with a legal basis.
Can I keep my existing phone number?
Usually yes. Calls are forwarded to the assistant through call forwarding, for example when unanswered or outside opening hours.
How long does setup take?
A simple setup with a greeting, questions and forwarding is usually done in a few days. Connecting to practice or trades software can take longer, depending on the interface.
Which provider is the best?
That depends on industry, software and call volume. An independent comparison with facts on eight providers is available at ki-telefonassistent-test.de (in German).
Transparency note: ki-telefonassistent-test.de is also operated by Avolang Vermittlung UG. The comparison there follows a published methodology; partner links are marked.