Three models, three cost logics
Anyone looking to hand over call handling has three options at heart. An in-house receptionist costs a salary and is therefore largely independent of call volume. An external answering service bills per call or per minute and gets more expensive the better business goes. An AI phone assistant costs a monthly base fee plus talk minutes, sitting in between — with a far flatter curve as volume grows.
The comparison is often framed wrongly because only the invoice is considered. What matters is the price per answered call and the value of the calls that get answered in the first place. A model that saves 400 euros a month but loses two enquiries a week is the most expensive option in most industries.
The figures below are typical market ranges for Germany and serve as orientation. Your actual case depends on call volume, call length and opening hours — there is a simple formula for that at the end.
Cost items missing from the quote
The hourly rate or per-minute price is only the visible part. These items decide the real cost:
- 01
Employer contributions and absence
On top of a gross salary come roughly 20 to 22 percent employer contributions. Add holidays, sick leave and public holidays, when the phone rings all the same.
- 02
Cover for fringe hours
Lunch break, after hours, weekends: real availability means either shifts or a second solution — and you pay for both.
- 03
Onboarding and turnover
Every new person at the front desk needs weeks before they answer confidently. When someone leaves, the effort starts over.
- 04
Follow-up work in the team
External services usually just take a message. Calling back, qualifying and entering the data still falls to your team — unbilled time that is rarely counted.
- 05
Setup and integrations
Porting the number, connecting calendar and CRM, writing the call guide. One-off, but relevant for the first-year total.
- 06
Missed calls
The most expensive item appears on no invoice. In trades or car dealerships a missed call is quickly a four-figure job that lands with a competitor.
The three models side by side
Orders of magnitude for a business with around 400 calls a month and an average call length of two minutes:
| Criterion | In-house / external service | AI phone assistant |
|---|---|---|
| Monthly cost | In-house from approx. EUR 2,800 incl. contributions, external service approx. EUR 400 to 800 | From EUR 69 base fee, talk minutes from EUR 0.30 |
| Availability | Office hours, fringe hours only at a surcharge | 24/7 at no surcharge, public holidays included |
| Simultaneous calls | One call per person | Any number in parallel |
| Cost as you grow | Rises linearly with volume | Only the talk minutes rise |
| Outcome per call | Usually a note and a callback request | Qualification, appointment in the calendar, CRM entry |
| Time to value | Weeks to months of onboarding | Days to productive use |
Where the AI option pulls ahead
Fixed cost instead of headcount
Call peaks cost no overtime and no temporary staff. The monthly figure stays predictable even when the campaign runs better than planned.
The call gets finished
An appointment in the calendar is worth more than a callback note. Whatever is closed on the spot creates no second round for the team.
No cost for idle time
You pay for talk minutes, not for presence. Quiet days cost nothing but the base fee.
Fringe hours without a surcharge
Evenings and weekends are when people who work during the day call. Those calls are often the most valuable — and the most expensive in classic models.
Three worked examples
Rounded figures, each based on an average call length of two minutes:
Trades business, 200 calls a month
400 talk minutes, around EUR 120 in minute costs plus the base fee. Compared to a part-time receptionist that is a mid four-figure saving per year — with better availability.
Medical practice, 800 calls a month
The front desk is blocked at peak times. When the AI takes appointment requests and routine questions, the load drops noticeably without hiring an extra person.
Car dealership with evening enquiries
Around 30 percent of calls arrive outside opening hours. Answering them books test drives that used to be lost — the added revenue clearly exceeds the service cost.
External answering service compared
At EUR 1.50 to 2.50 per call, 400 calls quickly add up to EUR 600 to 1,000 a month — for answering alone, without appointment booking or CRM entry.
How to run the numbers for your case
Four steps, five minutes, a defensible result:
Determine call volume
Pull the calls per month from your phone system, split into answered and missed. The number of missed calls is the actual lever.
Establish average call length
It usually sits between 90 seconds and three minutes. Volume times length gives you the minutes your variable cost is based on.
Use the full cost of today's solution
For in-house staff, gross salary plus around 21 percent contributions, plus the time colleagues spend on the phone instead of on their actual work. For an external service, the invoice plus internal follow-up.
Factor in the value of a job
Multiply missed calls by your close rate and your average order value. In most businesses this item is larger than the entire service fee.
Frequently asked questions about cost
What does an AI phone assistant cost per month?
With Rufori, plans start at EUR 69 per month and additional talk minutes cost EUR 0.30. At 400 calls of two minutes each, the total stays well below any staffing model.
What does a classic external answering service cost?
Typical market pricing is a base fee plus EUR 1.50 to 2.50 per answered call, sometimes billed per minute. Services such as appointment booking or CRM upkeep usually cost extra.
What does an in-house receptionist cost?
Full time, employer costs run around EUR 2,800 to 3,800 a month depending on region and qualification. In return the phone is staffed only during working hours.
From what call volume does AI telephony pay off?
Usually from a few dozen calls a month if calls are regularly lost. Mathematically it is less about volume than about the value of a single job.
Are there hidden costs?
Watch for setup fees, minimum terms, integration pricing and whether partial minutes are billed in full. Clarify these points before signing.
How quickly does the switch pay for itself?
In most cases within the first month. A single additional job won covers a full year of fees in trades, car dealerships or real estate.
Conclusion
The right question is not what the answering service costs, but what the missed call costs.
Fixed base fee, predictable minutes, every call answered. In most businesses that pays off in the first month.