# Route missed roofing calls to a Retell AI agent with Twilio: n8n workflow > Started by another system calling it, and works across Google Calendar, Google Sheets and Twilio. Source: https://millionrounds.com/workflow/route-missed-roofing-calls-to-a-retell-ai-agent-with-twilio (Millionrounds; every figure on the page links to its filing or article) [Automation library](https://millionrounds.com/workflows) · [Scheduling](https://millionrounds.com/workflows?category=Scheduling#library) # Route missed roofing calls to a Retell AI agent with Twilio Started by another system calling it, and works across Google Calendar, Google Sheets and Twilio. 31 steps, 4 branches: large, and worth reading before you trust it with anything live. Large [Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Froute-missed-roofing-calls-to-a-retell-ai-agent-with-twilio) **31 steps** Large: read it before trusting it with anything live **4** Branches: places the flow splits **0** Loops or waits **3** Services it connects to ## The flow Starts it 11 Logic 9 Service 11 The steps in the order they run, from what starts it. - 1 **Webhook - Retell Tools** Webhook *Starts it* - 2 **Webhook - Retell Call Ended** Webhook *Starts it* - 3 **Webhook - Twilio Fallback** Webhook *Starts it* - 4 **Switch - Route Tool Name** Switch *Logic* - 5 **Google Sheets - Update Lead Row By CallId** Google Sheets *Service* - 6 **Format Call Log Entry** Code *Logic* - 7 **Google Sheets - Lookup Service Area** Google Sheets *Service* - 8 **Google Calendar - Get Busy Events** Google Calendar *Service* - 9 **Code - Parse Booking Args** Code *Logic* - 10 **Google Sheets - Append Urgent Lead** Google Sheets *Service* - 11 **If - Booking Completed** If *Logic* - 12 **Google Sheets - Append Call Log** Google Sheets *Service* - 13 **If - Call Was Answered** If *Logic* - 14 **Code - Build Service Area Response** Code *Logic* - 15 **Code - Compute Open Slots** Code *Logic* - 16 **Google Sheets - Search Recent Duplicate** Google Sheets *Service* - 17 **Twilio - SMS On-Call Estimator** Twilio *Service* - 18 **Twilio - SMS Owner Call Summary** Twilio *Service* - 19 **Twilio - SMS Office Manager (Needs Follow-up)** Twilio *Service* - 20 **Respond to Webhook - Call Handled** Respond To Webhook *Starts it* - 21 **Respond to Webhook - Route to AI** Respond To Webhook *Starts it* - 22 **Respond to Webhook - Service Area Result** Respond To Webhook *Starts it* - 23 **Respond to Webhook - Availability Result** Respond To Webhook *Starts it* - 24 **Code - Check Duplicate Window** Code *Logic* - 25 **Respond to Webhook - Escalated Result** Respond To Webhook *Starts it* - 26 **Respond to Webhook - Ack** Respond To Webhook *Starts it* - 27 **If - Is Duplicate Lead** If *Logic* - 28 **Respond to Webhook - Duplicate Result** Respond To Webhook *Starts it* - 29 **Google Calendar - Create Inspection Event** Google Calendar *Service* - 30 **Google Sheets - Append Lead Row** Google Sheets *Service* - 31 **Respond to Webhook - Booking Confirmed** Respond To Webhook *Starts it* ## How it's built - **Starts on:** Another system calling it - **Steps:** 31, with 4 branches - **Size:** Large: read it before trusting it with anything live - **Connects to:** Google Calendar, Google Sheets, Twilio - **Model:** None. This is plumbing, not judgement ## Questions What does it need to run? An n8n account, plus your own Google Calendar, Google Sheets and Twilio accounts. You connect your own accounts after importing it; none are included. What starts it? It starts on another system calling it. Does it use AI? No. Every step is fixed logic or a call to a service, so it does the same thing every time. How long does it take to set up? Take your time. At 31 steps it is large: read it before trusting it with anything live. How do I import it? Copy the workflow, open a new workflow in n8n and paste. The steps appear on the canvas, ready for your own accounts. **Before you run it** Nothing here has been tested by us. It is somebody's working automation, read and described from its own steps. Treat the connections it wants as a list of accounts it will touch, and read the 31 steps before you point it at anything that matters. ## Run it in n8n - **Create your n8n account** Free to start. n8n is where the workflow runs. [Create an n8n account ↗](https://millionrounds.com/n8n) - **Download the workflow** Free with a Millionrounds account. [Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Froute-missed-roofing-calls-to-a-retell-ai-agent-with-twilio) - **Paste it into n8n** Open a new workflow in n8n and paste. Then connect your own accounts. Stored with the author's traces removed: canvas notes, instance identifiers, saved credential names and any live document they had left behind. ## Connects to Each opens the other workflows that use it. [Google Calendar](https://millionrounds.com/workflows?service=Google+Calendar#library)[Google Sheets](https://millionrounds.com/workflows?service=Google+Sheets#library)[Twilio](https://millionrounds.com/workflows?service=Twilio#library) ## Workflows like it Also scheduling, with the same services where possible, closest in size first. - [**AI secretary for scheduling with WhatsApp and Telegram** 31 steps · calls a model · Google Calendar, Redis](https://millionrounds.com/workflow/ai-secretary-for-scheduling-with-whatsapp-and-telegram) - [**Calendar Management & RAG Agent with OpenAI and OpenRouter** 31 steps · calls a model · Google Calendar, n8n data table](https://millionrounds.com/workflow/calendar-management-and-rag-agent-with-openai-and-openrouter) - [**Ultimate AI assistant: Automate email, calendar, webSearch** 31 steps · calls a model · Gmail, Google Calendar](https://millionrounds.com/workflow/ultimate-ai-assistant-automate-email-calendar-websearch) - [**Validate property compliance risk and orchestrate actions** 31 steps · calls a model · Gmail, Google Calendar](https://millionrounds.com/workflow/validate-property-compliance-risk-and-orchestrate-actions) - [**WhatsApp appointment scheduling with Google Calendar** 32 steps · Google Calendar, Postgres](https://millionrounds.com/workflow/whatsapp-appointment-scheduling-with-google-calendar) - [**Automate email & calendar management with Gmail** 32 steps · calls a model · Gmail, Google Calendar](https://millionrounds.com/workflow/automate-email-and-calendar-management-with-gmail)