Take this into the demo

AI Receptionist: questions to ask

From The AI Agents Report by Iterategy · iterategy.com/research/ai-agents/jobs/ai-receptionist/

The nine questions

Does an AI do this, or does a rule? If the answer is “when X happens it sends Y”, you are buying automation, and it should not cost AI prices.
Does it send, or does it draft? Ask for the sentence on their page that says it acts on its own.
Does it do it on its own on this plan, or on the one above? The setting that lets it act without you is often a tier up from the entry price.
What does it do with the hard cases? Ask what it holds back for you, and what happens to what it cannot resolve.
What is the cap, and what happens past it? Work out the bill at the volume you actually do, not at the included allowance.
What is the unit? Per month, per user, per location, per minute, per credit or per resolved ticket.
Who does the setup, and is it in the price?
What happens to the changes it made when I stop paying? Some tools make changes that stay only while you subscribe.
Who carries the legal side? For calling and texting customers, ask who handles consent and opt-outs.

Most of these really do answer, talk with the caller and book the job or take the message on their own, with no one in the loop.
The big phone systems and field service software now include one. Check what your current phone or job software already offers before buying a separate product.
The monthly call or minute limit sets what you actually pay. Entry plans are sized for low volumes, so price it at your real number of calls.
Ask how it handles spam calls. Some screen them out; others count them against your limit.
In reviews, billing and refund problems, slow support and uneven call quality come up most. Ask about the contract length and cancellation before you sign.