n8n Workflow: Twilio Missed Call SMS + Google Calendar Booking

Never miss a missed call: Twilio SMS auto-reply + AI call-to-Google Calendar booking

This n8n workflow automatically texts back people who miss your inbound calls using Twilio, logs every call to Google Sheets, alerts the business owner, and turns your voice AI end-of-call summaries into Google Calendar booking events—so qualified leads don’t slip away.

What this workflow does

• Handles missed inbound calls via Twilio webhooks: When a Twilio call-status webhook reaches the workflow, missed calls trigger an instant SMS reply to the caller.
• Logs activity in Google Sheets: Missed calls are recorded in a dedicated MissedCalls sheet tab, and voice call results are stored in VoiceCalls.
• Notifies the owner: Each missed call (and later, the booked outcome) triggers an owner alert for fast follow-up.
• Converts voice AI summaries into booking details: After the call ends, your voice AI posts an end-of-call report; the workflow extracts caller name, phone, service, and time with AI, then builds the correct event timing.
• Creates the booking in Google Calendar: It creates a Google Calendar event, sends the caller a confirmation text, logs the call, and notifies the owner.

Use cases

• Local service businesses (plumbers, clinics, salons, contractors) that lose jobs when callers hit voicemail.
• Automation engineers who want an n8n workflow for lead capture that connects phone, AI, and scheduling in one flow.
• SaaS operators managing intake across calls and bookings with consistent logging and alerts.

Technical details

• Integrations / nodes: Twilio, Webhook, Google Sheets, Google Calendar
• Workflow logic: if, set, code, sticky note
• Voice AI requirement: A Vapi or Retell voice agent for end-of-call reporting

Setup (quick)

Connect Twilio, Google Sheets, Google Calendar, and OpenAI credentials; fill the two CONFIG nodes (business name, numbers, sheet ID, calendar ID, booking link); point Twilio’s voice webhook to the workflow production URL and point your voice AI end-of-call report to the second webhook; create the MissedCalls and VoiceCalls tabs.