The honest answer is that a good AI receptionist handles the vast majority of calls, but not every one, and what it does on the calls it cannot finish is the real test. A well-built assistant does not bluff. It admits it does not know, then captures the caller and hands the request to you cleanly. A cheap one guesses, and a wrong answer on the phone can cost you the customer.
“The question to ask any vendor is not ‘can it answer everything?’ Nothing can. Ask ‘what does it do when it does not know?’ That single behaviour separates a trustworthy assistant from a liability.”
Matúš Koleják, Co-Founder, AI Receptionist Now
Does it bluff, or admit it doesn't know?
This is the line that matters. A good AI receptionist is configured to stay inside what you have actually told it and to say so when a question falls outside that, rather than inventing a plausible sounding answer. An assistant that confidently makes things up, what people call “hallucinating,” is worse than one that simply takes a message, because the caller leaves believing something untrue.
What a good fallback looks like
When it reaches the edge of what it knows, it should still leave the caller with a next step. The usual options, in order of preference:
- Transfer to a person if someone is available and the question warrants it.
- Book a callback at a specific time so the caller is not left chasing you.
- Take a detailed message with the context you need to follow up, not just a name and number.
The difference between this and old voicemail is that the caller is heard, captured, and given a commitment, instead of dropped into a mailbox. For how the handoff itself works, see can an AI receptionist transfer calls to a human.
How to test for hallucination before you buy
Do not take a polished demo on faith. On a live call, ask it something you deliberately never told it, an obscure policy, a price on a service you do not offer, a detail it cannot know. A trustworthy assistant will admit it does not have that information and offer to get you an answer. If it confidently invents one, walk away. Five minutes of trying to trip it up tells you more than any feature list.
Most of these gaps are avoidable in the first place: the more accurately you set up what the AI knows about your business, the less often it reaches an answer it does not have. For the full buyer's framework, see how to choose an AI receptionist, or hear ours handle an edge case on the homepage demo.