How I built an AI cold caller that books meetings while I sleep

When I first started running Facebook ads and cold emails, I was generating leads, but I wasn’t following up fast enough.

Leads would come in, I’d tag them in a sheet, then eventually someone (usually me) would start calling. By then, half of them were cold.

So I built a system to call every lead automatically.

It runs on n8n, Vapi, and Google Sheets.
Upload a list of leads, and the AI caller starts dialing.
It sounds completely human, books meetings, takes notes, and updates the sheet in real time.

It can make around 600 calls an hour.

At first, I only used it inside my agency to follow up on ad leads. Then clients started asking if they could use the same system, so I packaged it into a template anyone can import and run.

What surprised me most was how many people don’t want the service, they just want the system. Something they can run without waiting on anyone else.

Lessons so far

Speed matters more than personality. Calling a lead within minutes beats any perfectly crafted script.

Productizing your systems saves time. I don’t rebuild this setup for every new client anymore; they just import it.

AI doesn’t replace the rep. It replaces the first step: qualifying and booking. The rep still closes.

I’m planning to post a technical breakdown next: how Vapi handles the calls, how n8n tracks the results, and how booked leads get passed to the team.

Would that be helpful to anyone here?