GPT-4o: Twilio Integration with Auto Follow-up Features

How it works

• Twilio webhook detects missed/unanswered calls automatically
• Analyzes call context (time of day, business hours, weekend/weekday)
• Checks CRM for existing customer data and purchase history (optional)
• AI Chain (GPT-4o) generates personalized recovery messages for SMS and Email
• Sends instant apology with booking link via SMS and/or Email
• Logs all interactions to Airtable for tracking
• Slack alerts sales team with customer priority and context
• Waits 24 hours and checks if customer booked
• Sends automatic follow-up SMS if no booking detected
• Structured output parser ensures reliable JSON formatting

Set up steps

• Time to set up: 15-20 minutes
• Add Twilio credential and configure phone number in both SMS nodes
• Get Slack channel ID for sales team alerts
• Create Airtable base with 10 columns (Caller_Number, Customer_Name, Call_Time, Priority, SMS_Sent, Email_Sent, Booking_Link, Status, Urgency_Score, Follow_Up_Date)
• Replace booking URL with your Cal.com or Calendly link
• Configure business email for SMTP sending
• Update business phone and name in follow-up SMS
• Add credentials: Twilio API, OpenAI (GPT-4o), Slack OAuth2, Airtable Token, SMTP Email
• Replace placeholder IDs in Slack and Airtable nodes
• Optional: Configure CRM API for existing customer lookup (or disable those nodes)

What you'll need

• Twilio - Phone number with SMS capability
• OpenAI API - GPT-4o access for AI message generation
• Slack - Standard workspace for sales alerts
• Airtable - Free plan works for call tracking
• Email SMTP - Gmail, SendGrid, or any SMTP provider
• Cal.com or Calendly - Booking link for instant scheduling
• CRM API (optional) - HubSpot, Salesforce, or custom CRM

Who this is for

Service businesses, agencies, and sales teams that lose revenue from missed calls. Perfect for businesses with high call volume that need instant personalized follow-up to recover lost opportunities.