Managed Agents at Previously $0.06 $0.03/minManaged Agents are Previously $0.06 $0.03/min.
Automation

n8n AI voice agents that call your workflows mid-conversation

A webhook tool posts the caller's details to an n8n Webhook node, and the workflow's response becomes the agent's answer.

Start buildingRead the docs

Workflow agent

Sends caller requests to an n8n workflow.

Instructions

Collect name, phone and request, run the workflow, and read the result back plainly. If it returns an error, apologize and offer a callback. Transfer to the office line if the caller asks for a person.

Handoff
Office

Connected tools

  • Run workflowWebhook
  • Transfer to officeTransfer

What a n8n AI voice agent can do

Open one to watch a call. The grey lines are the tools the agent calls mid-sentence.

A self-hosted n8n keeps data on your side. The workflow's URL only needs to be reachable over public HTTPS.

Tool definitions

Webhook tools go to POST /v1/agents/tools. Transfers are a system tool on the agent. Replace the placeholder values in capitals with your own.

Webhook

Run workflow

Posts the request to a workflow webhook.

Show the JSON definition
run_workflow
{
  "type": "webhook",
  "name": "run_workflow",
  "description": "Runs the workflow with the caller's details and returns its result.",
  "pre_tool_speech": "auto",
  "execution_mode": "immediate",
  "response_timeout_secs": 20,
  "api_schema": {
    "url": "https://n8n.your-company.com/webhook/voice-request",
    "method": "POST",
    "request_body_schema": {
      "type": "object",
      "properties": {
        "name": {
          "type": "string",
          "description": "Caller's name."
        },
        "phone": {
          "type": "string",
          "dynamic_variable": "system__caller_id"
        },
        "request": {
          "type": "string",
          "description": "What the caller needs."
        }
      },
      "required": [
        "name",
        "request"
      ]
    },
    "request_headers": {
      "X-Webhook-Secret": {
        "type": "secret",
        "secret_value": "YOUR_SHARED_SECRET"
      }
    }
  }
}

Transfer

Transfer to office

Cold transfer to your office.

Show the JSON definition
transfer_to_office
{
  "config": {
    "system_tools": {
      "transfer_to_number": {
        "description": null,
        "pre_tool_speech": "auto",
        "transfers": [
          {
            "destination": {
              "type": "phone",
              "phone_number": "+14155550124"
            },
            "condition": "The caller asks for a person, or the workflow returns an error twice."
          }
        ]
      }
    }
  }
}

Set it up

Through n8n's Webhook node. The agent has no n8n-specific node. A webhook tool posts to your workflow's production URL. Vendor details read in October 2026.

  1. Add a Webhook node

    Set HTTP Method to POST and use the production URL, not the test URL, once you go live.

  2. Require a header

    Set the Webhook node's Authentication to Header Auth with the same header name and secret the tool sends.

  3. Respond with data

    Set Respond to When Last Node Finishes, which returns the last node's data.

  4. Add the tool and test

    Paste the URL, add the header secret, and call the agent.

Documentation

Before you build

Private networks are blocked

Cartesia blocks webhook calls to private and internal address ranges, so a workflow on your LAN needs a public HTTPS entry point.

Use the production URL

n8n registers the test URL only while you listen for a test event in the editor. Publish the workflow and use the production URL.

Use cases for teams on n8n

Customer support

Resolve support calls on the first try, refund and credit within your rules, and keep customers who call to cancel.

See the use case

SDR and lead qualification

Call new leads within minutes, qualify them on your criteria, and book meetings with your reps.

See the use case

More integrations

All integrations
Automation

Zapier

Send a voice agent's calls and tool requests to Zapier through a catch hook, then reach the apps Zapier connects to.

  • Managed Agents
See the integration
Automation

Make

Trigger a Make scenario from a voice agent through a custom webhook, and run the call's data into your apps.

  • Managed Agents
See the integration
Webhook tool

Notion

File each call as a page in a Notion database, through a service of yours that calls the Notion API.

  • Managed Agents
See the integration

Enterprise-grade security

  • HIPAA compliant badge

    HIPAA compliant

  • SOC 2 Type 2 badge

    SOC 2 Type 2

  • GDPR badge

    GDPR

n8n AI voice agent FAQs

How do I build an n8n voice agent?

Pair a Cartesia voice agent with an n8n Webhook node. The agent answers the call and uses a webhook tool to post the caller's details to your workflow, and the workflow's response becomes what the agent says next. n8n has no Cartesia node, so the webhook is the whole connection.

Does it work with self-hosted n8n?

Yes, if the webhook URL is reachable over public HTTPS. Cartesia blocks webhook calls to private and internal address ranges, so a workflow on your LAN needs a public entry point.

Why does the tool fail with my n8n webhook URL?

It is often the test URL. n8n registers the test URL only while you listen for a test event in the editor. Publish the workflow, point the tool at the production URL, and use the POST method.

How do I secure the n8n webhook?

Send a shared secret header from the Cartesia tool, and set the Webhook node's authentication to Header Auth with the same name and value. n8n then rejects calls to the URL that don't carry the header.

Who bills what on an n8n setup?

Cartesia bills the call, and n8n runs on n8n Cloud or your own server. Agents run at $0.03/min, plus LLM usage and telephony. A self-hosted n8n adds only the cost of the server it runs on.

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