AI phone agent to qualify leads (Retell AI + Twilio)

Starts when something happens in a connected app and works with Gmail, Google Sheets, OpenAI, Twilio SMS. Uses AI.

Main steps

Detect new lead in Google Sheets
Send SMS reminder to call lead in 5 minutes
Wait 5 minutes before making call
Call new lead using RetellAI
Receive inbound call from RetellAI (webhook)
Check if phone number exists in Google Sheets

What you get

workflow.json – import into n8n (14 steps, starts from an event in a connected app)
README setup guide and an in-workflow setup note

You need

n8n (Cloud or self-hosted)
Gmail account
Google Sheets account
OpenAI account
Twilio SMS account