💬 Create a WhatsApp voice assistant with Twilio, VAPI, Google Calendar & OpenAI

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Description

WhatsApp Voice Agent with Twilio, VAPI, Google Calendar, Gmail & Supabase

This workflow turns WhatsApp voice messages into an AI assistant using Twilio, VAPI, and modular MCP servers. It handles scheduling, email, and knowledge queries all by voice.

🔎 How it works

1. WhatsApp → Twilio → VAPI
   • A WhatsApp Business number (via TwiML app) receives a voice message.
   • Twilio streams the audio into VAPI for processing.
2. VAPI → n8n Webhook
   • VAPI interprets the intent and routes the request to the correct MCP server.
3. MCP Servers in n8n
   • 📅 Calendar MCP → create, fetch, update, delete Google Calendar events
   • 📧 Gmail MCP → send confirmation or reminder emails
   • 📚 Knowledge Base MCP → query Supabase Vector Store with OpenAI embeddings
4. n8n → VAPI → WhatsApp
   • n8n executes the task and returns the result via VAPI back to the user.

🛠️ How to use

• Import this workflow into your n8n instance.
• Configure a Twilio WhatsApp-enabled number and connect it to a TwiML app.
• Point the TwiML app to your VAPI project.
• Add credentials for Google Calendar, Gmail, Supabase, and OpenAI in n8n.
• Test by sending a WhatsApp voice command like:
  • “Book a meeting tomorrow at 3pm”
  • “Send a confirmation email to the client”
  • “What’s included in the AI receptionist package?”

🎨 Customisation ideas

• Add more MCP servers (e.g. CRM, Notion, Slack).
• Swap Supabase for another vector database.
• Extend Gmail flows with templates or multiple senders.
• Adjust the VAPI assistant’s tone and role to fit your brand.

📌 Requirements

• Twilio WhatsApp-enabled number + TwiML app (verified in WhatsApp Manager)
• VAPI project (assistant configured)
• n8n instance (Cloud or self-hosted)
• Google Calendar & Gmail credentials
• Supabase project
• OpenAI API key

💡 Good to know

• Twilio must have a verified WhatsApp Business number.
• VAPI handles voice infra + intent routing; n8n only executes actions.
• The design is modular—easy to expand with new MCP servers.
• Works best when tested with short, clear commands.

🚀 Use cases

• Hands-free scheduling with Google Calendar.
• Voice-triggered email confirmations & reminders.
• Conversational knowledge base access.
• Extendable to CRMs, team chat, or business workflows.

👉 With this setup, you get a scalable voice-first AI agent on WhatsApp that connects seamlessly to your business systems.

🔗 Nodes Used

Webhook, Embeddings OpenAI, Supabase Vector Store, MCP Server Trigger

📥 Import

Download workflow.json and import into n8n: Workflow menu → Import from File

📖 Importing guide · 🔑 Credential setup