Twilio Missed Call SMS Alert n8n Workflow for Local Services

Instant SMS after missed calls—so local customers get booked and you stay responsive

This n8n workflow uses Twilio to automatically detect a missed call and immediately text the caller with your business info and booking link—while also sending you an SMS alert with the caller’s number and handling SMS replies with STOP/START opt-outs.

What this workflow does

• Receives a Twilio Voice webhook when a call attempt completes.
• Checks the call status to confirm it was missed (including no-answer, busy, failed, or canceled) and verifies the caller is not on the workflow’s opt-out list.
• Sends an automated SMS from your Twilio number to the caller with your business name, a help prompt, and a booking link that includes STOP opt-out text.
• Sends an SMS alert to the owner containing the caller’s number so you can call back quickly.
• Handles replies via Twilio Messaging webhook: replies are received on your Twilio number.
• Honors STOP/START keywords by recording them to update the opt-out list; normal SMS replies are forwarded to the owner by SMS.
• Responds to Twilio with an empty TwiML for the webhooks as described in the workflow.

Use cases

• Plumbers who can’t answer mid-job: missed callers get a booking link instantly.
• HVAC technicians: you receive an SMS with the caller’s number for fast follow-up.
• Roofers and local service businesses: capture leads even when calls go unanswered.

Technical details

• Uses n8n nodes: if, set, code, twilio, webhook, sticky note.
• Requires adding your Twilio credentials in n8n and selecting them in Twilio nodes used for sending SMS.
• Configure workflow settings with: business name, Twilio phone number, owner mobile number, and booking link (use E.164 formatting).
• Configure Twilio Console: Voice flow POST to the missed-call webhook URL, and Messaging webhook POST to the inbound SMS endpoint.