Retell AI + n8n / Make.com Integration Guide
A Retell AI voice agent becomes truly powerful when it's connected to the rest of your business. n8n and Make.com are the glue — they take what the agent captures on a call and turn it into real actions: booking, CRM updates, follow-up SMS and more. Here's how the integration works.
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Why connect Retell AI to n8n or Make.com
On its own, a voice agent talks. Connected to n8n/Make, it acts across every tool you use.
- Push captured lead data into your CRM
- Trigger follow-up email/SMS after a call
- Sync bookings to your calendar and systems
- Alert your team on Slack for hot leads
- Log every call and outcome automatically
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How the integration works (webhooks)
Retell's Custom Function feature fires an HTTPS webhook with structured arguments the LLM extracts from the conversation. That webhook hits an n8n or Make.com scenario, which then does the work.
- The agent extracts data (name, intent, time) mid-call
- It fires a webhook to your n8n/Make scenario
- The scenario runs the actions (CRM, calendar, SMS)
- Results can even be passed back into the call
Post-call automation
You can also trigger automations after the call ends, using Retell's call events and transcripts.
- Summarise the call with AI and log it
- Route the lead based on what was said
- Send a tailored follow-up sequence
- Update deal stage in your CRM
A real example flow
A typical booking agent, fully wired up.
- Caller books an appointment on the call
- Webhook → n8n → creates the calendar event
- n8n sends an SMS + email confirmation
- n8n logs the lead in the CRM and alerts sales