Why the demo call misleads you
Almost every AI receptionist sounds good in a demo. The demo is a scripted conversation on a quiet line with a cooperative caller.
Your calls are not that. Someone calls from a job site with a truck running, gives half an address, interrupts, and asks a question the script did not anticipate.
So judge the demo on the messy parts. Interrupt it mid sentence. Ask something off script. Give a wrong answer and then correct yourself. What you learn in those ten seconds is worth more than the whole scripted call.
The six things that actually differ
First, time to answer. Anything above a few seconds and the caller assumes nobody is there. Ask for the number and then verify it yourself by calling.
Second, whether it knows your business or only general things. A receptionist that cannot say whether you cover a zip code, or what a diagnostic costs, is a voicemail with better manners.
Third, the handoff. What exactly happens when a real job calls? Does someone get notified in the moment, with the details, or does it land in an inbox nobody reads until tomorrow?
Fourth, what it does when it does not know. The right behavior is to say so and pass the call. The wrong behavior is to improvise, and improvising is the failure mode that costs you a customer.
Fifth, the record. Every conversation should be written down and readable. Without that you cannot tell a good month from a lucky one.
Sixth, follow up. Most leads are not lost on the first call, they are lost in the silence after it.
The questions to ask a vendor
Can I keep my current number, and what breaks if I do? Porting or forwarding should be boring. If it is complicated, that complexity will show up again later.
What happens when ten people call at the same time? A real answer is that they are all answered. A hold queue defeats the purpose.
Show me a conversation where it failed. A vendor who cannot show you a failure has either not run enough calls or is not looking at them.
Who configures it, and how long until it knows my business? If the answer is that you fill in a form, you will get form quality answers.
How to run a fair trial
Point only your after hours calls at it first. That is where the missed calls already are, so the downside is close to zero and the upside is visible in a week.
Then read every transcript for the first week. Not a summary, the actual conversations. You will find two or three things it says wrong, and those are cheap to fix early and expensive to fix after a month.
Measure one number: of the calls it handled, how many were real jobs your team would have wanted. That ratio tells you whether it is working better than any dashboard will.
When an AI receptionist is the wrong answer
If your phone barely rings, this is not your problem. Fix demand first.
If your team will not call the qualified leads back quickly, the receptionist just creates a faster queue of people waiting on you.
And if your sale genuinely requires a person from the first second, for reasons of trust or regulation, say so and stay with people. An honest vendor will tell you the same thing.