Run an AI voice receptionist with Vapi, Google Calendar and Twilio SMS

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                  "label": "The ultimate guide to automate your video collaboration with Whereby, Mattermost, and n8n"
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                },
                {
                  "url": "https://n8n.io/blog/creating-custom-incident-response-workflows-with-n8n/",
                  "label": "How to automate every step of an incident response workflow"
                },
                {
                  "url": "https://n8n.io/blog/learn-to-build-powerful-api-endpoints-using-webhooks/",
                  "icon": "\ud83e\uddf0",
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                {
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                  "icon": "\ud83e\udd84",
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                {
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                {
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                  "label": "How to get started with CRM automation (with 3 no-code workflow ideas"
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                {
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                  "icon": "\ud83d\udc66",
                  "label": "Build your own virtual assistant with n8n: A step by step guide"
                },
                {
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            "subcategories": {
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          }
        },
        "group": "[\"transform\"]",
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                {
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        "name": "n8n-nodes-base.respondToWebhook",
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        },
        "group": "[\"transform\"]",
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          "name": "Respond to Webhook"
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      {
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        "group": "[\"input\"]",
        "defaults": {
          "name": "Sticky Note",
          "color": "#FFD233"
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              "Javascript",
              "JS",
              "Python",
              "Script",
              "Custom Code",
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            "resources": {
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          "name": "Code"
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        "typeVersion": 2,
        "nodeCategories": [
          {
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            "name": "Development"
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  },
  "detail": {
    "description": "Quick Overview This workflow lets a Vapi voice assistant manage appointments by checking and updating Google Calendar, sending confirmations via Twilio SMS, and logging callback messages to Google Sheets, while also sending missed-call follow-ups and auto-replying to inbound SMS. How it works 1. Receives Vapi tool-call webhook requests during a call, normalizes the caller phone number, and routes the request by tool name. 2. For availability checks, reads the selected day\u2019s events from Google Calendar and returns a list of open time slots based on clinic hours and slot length. 3. For bookings, creates a Google Calendar event, sends a Twilio SMS confirmation to the caller, and returns the booking outcome to Vapi. 4. For lookup, searches Google Calendar for upcoming events matching the caller\u2019s phone number and returns a formatted list that includes event IDs for follow-up actions. 5. For rescheduling or cancellation, updates or deletes the specified Google Calendar event, sends a Twilio SMS update to the caller, and returns the result to Vapi. 6. For message taking or unknown requests, appends the caller\u2019s details to Google Sheets or returns an error message, and then responds to Vapi with the tool result. 7. Separately, processes Vapi end-of-call-report events to detect missed calls and sends a Twilio SMS follow-up, and answers inbound Twilio SMS replies with a fixed TwiML message via a webhook. Setup 1. Add credentials for Google Calendar OAuth2, Google Sheets OAuth2, and Twilio. 2. Replace placeholders like YOURGOOGLECALENDARID, YOURGOOGLESHEETID, YOURTWILIOPHONENUMBER, and update [YOURCLINICNAME] in the SMS message texts. 3. Create a Google Sheet with columns named Time, Name, Phone, and Reason, and ensure the workflow\u2019s Google Sheets node points to the correct document and sheet. 4. In Vapi, configure tools named checkavailability, bookappointment, findbooking, reschedulebooking, cancelbooking, and takemessage to use the workflow\u2019s Vapi Tools webhook URL, and send end-of-call-report events to the Vapi Events webhook URL. 5. In Twilio, set your phone number\u2019s incoming SMS webhook to the workflow\u2019s SMS Reply webhook URL. 6. Set the workflow timezone (and optionally the default phone country code and clinic hours/slot length in the code blocks) to match your local scheduling rules."
  }
}