n8n Missed Call Alerts: Twilio SMS + Email from CallRail/Webhooks

Stop missing missed calls—automatically text back and alert your team

This n8n workflow listens for call completion webhooks from Twilio or CallRail, detects genuine missed calls, suppresses duplicates, and sends an SMS “text-back” via Twilio (plus an email alert to your business with send results).

What this workflow does

• Receives call completion webhooks from Twilio (call status callback) or CallRail (call webhook).
• Normalizes the provider payload into a common schema and stops processing if the event can’t be confirmed as a valid missed call.
• Deduplicates events using a 24-hour idempotency window to prevent multiple SMS replies from repeated webhook deliveries.
• Checks business hours by comparing the original call time against configured business hours in the specified timezone.
• Personalizes the missed-call SMS with your business name and an optional booking link, using different message copy for after-hours.
• Sends a single SMS reply via Twilio and verifies whether Twilio accepted the message (via returned SID).
• Sends an email alert to your business including caller details, the SMS content, and whether the SMS was accepted or needs manual follow-up.

Use cases

• Your call tracking and telephony stack (Twilio/CallRail) flags missed calls—this workflow automatically responds with a text-back after-hours and notifies your team.
• Webhook retries can cause duplicate alerts—24-hour deduplication keeps customer messaging consistent.
• Operators want visibility into delivery—email includes the caller info and Twilio acceptance status.

Technical details

• Nodes/logic used: webhook, if, code, no op, twilio, email send.
• Credentials required: a Twilio credential for outbound SMS, and an SMTP email credential for owner alerts.
• Setup items: configure the webhook URL in Twilio/CallRail, then set n8n variables such as BUSINESS_NAME, BUSINESS_ALERT_EMAIL, and BUSI (plus business-hours/timezone parameters).