How to Build a Voice AI Agent That Answers Calls and Books Meetings Automatically

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Developers can build a fully automated inbound call-handling system using Vapi, Twilio, Calendly, and n8n without writing custom telephony code. The setup involves a Vapi AI agent that conducts a scripted qualifying conversation with callers, collecting their name, company, and key details. Twilio provides the inbound phone number and routes calls to Vapi, while n8n orchestrates the webhook chain between all services. Captured lead data can optionally be stored in HubSpot CRM, and a Calendly link is automatically sent to book a follow-up meeting. The entire minimal production-ready workflow can be built in one to two days, assuming accounts for all required services are already in place.

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