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.