Retell Sprachagent mit benutzerdefinierten Funktionen verbinden
Fortgeschritten
Dies ist ein Support, AI, IT Ops-Bereich Automatisierungsworkflow mit 7 Nodes. Hauptsächlich werden Set, Webhook, RespondToWebhook und andere Nodes verwendet, kombiniert mit KI-Technologie für intelligente Automatisierung. Retell-Sprachagent mit einer benutzerdefinierten Funktion integrieren
Voraussetzungen
- •HTTP Webhook-Endpunkt (wird von n8n automatisch generiert)
Verwendete Nodes (7)
Workflow-Vorschau
Visualisierung der Node-Verbindungen, mit Zoom und Pan
Workflow exportieren
Kopieren Sie die folgende JSON-Konfiguration und importieren Sie sie in n8n
{
"meta": {
"instanceId": "f4f5d195bb2162a0972f737368404b18be694648d365d6c6771d7b4909d28167"
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"nodes": [
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"id": "693e094e-0329-455d-9c42-ba398dd40955",
"name": "Webhook-Trigger",
"type": "n8n-nodes-base.webhook",
"position": [
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"webhookId": "825f729b-34e1-4c34-8687-f48b7118b749",
"parameters": {
"path": "hotel-retell-template",
"options": {
"responseData": "={\"response\":\"Your booking is confirmed\"}"
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"httpMethod": "POST"
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"id": "6172b8b6-4950-4b7f-a60c-ce782139f24c",
"name": "Auf Webhook-Trigger antworten",
"type": "n8n-nodes-base.respondToWebhook",
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{
"id": "6ebeaeb7-4ec5-4f5d-b8d5-3fd51ca8604c",
"name": "[Ersetze mich!] Antwort festlegen",
"type": "n8n-nodes-base.set",
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"parameters": {
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"assignments": {
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"value": "Your booking has been confirmed!"
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{
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"name": "Notizzettel",
"type": "n8n-nodes-base.stickyNote",
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"parameters": {
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"content": "### 🧠 Place your logic here!\nYour Agent logic goes here.\nYou can, for example, use an **AI Agent** to provide information back to your Retell agent and/or **make an action in a third party service**. For example: book an event, add a contact to a CRM, etc. \nSky is the limit! 🙌"
},
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"name": "Notizzettel2",
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"content": "### Retell Custom Function Webhook\nPOST Webhook received from Retell's Custom Function each time it is triggered by Retell's Voice Agent"
},
"typeVersion": 1
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{
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"content": "### Retell Custom Function Response\nResponse to the webhook that will be provided back to Retell's Voice Agent.\n\n**Modify the response accordingly** if you want anything else than the first incoming input being sent back"
},
"typeVersion": 1
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"content": "## Connect Retell Voice Agents to Custom Functions\n\n## Overview\n- This workflow allows you to **trigger custom logic in n8n directly from Retell's Voice Agent** using [Custom Functions](https://docs.retellai.com/build/conversation-flow/custom-function#custom-function).\n- It captures a POST webhook from Retell every time a Voice Agent reaches a Custom Function node.\n- You can plug in any logic—call an external API, book a meeting, update a CRM, or even return a dynamic response back to the agent.\n\n## Who is it for\nFor builders using [Retell](https://www.retellai.com/) who want to **extend Voice Agent functionality** with real-time custom workflows or AI-generated responses.\n\n## Prerequisites\n- Have a [Retell AI Account](https://www.retellai.com/)\n- A Retell agent with a Custom Function node in its conversation flow (see template below)\n- Set your n8n webhook URL in the Custom Function configuration (see \"How to use it\" below)\n- (Optional) Familiarity with [Retell's Custom Function docs](https://docs.retellai.com/build/conversation-flow/custom-function#custom-function)\n- Start a conversation with the agent (text or voice)\n\n## Retell Agent Example\nTo get you started, **[we've prepared a Retell Agent](https://drive.google.com/file/d/1rAcsNz-f8SyuOxO0VJ_84oPscYFpir4-/view?usp=sharing)** ready to be imported, that includes the call to this template.\n- Import the agent to your Retell workspace (top-right button [on your agent's page](https://dashboard.retellai.com/agents))\n- You will need to modify the function URL in order to call your own instance.\n- This template is a simple hotel agent that calls the custom function to confirm a booking, passing basic formatted data.\n\n## How it works\n- Retell sends a webhook to n8n whenever a Custom Function is triggered during a call (or test chat).\n- The webhook includes:\n - Full call context (transcript, call ID, etc.)\n - Parameters defined in the Retell function node\n- You can process this data and return a response string back to the Voice Agent in real-time.\n\n## How to use it\n1. Copy the webhook URL (e.g. `https://your-instance.app.n8n.cloud/webhook/hotel-retell-template`)\n2. Modify the Retell Custom Function webhook URL (see template description for screenshots)\n - Edit the function\n - Modify the URL\n3. Modify the logic in the Set node or replace it with your own custom flow\n4. Deploy and test: Retell will hit your n8n workflow during the conversation\n\n## Extension Ideas\n- Call a third-party API to fetch data (e.g. hotel availability, CRM records)\n- Use an LLM node to generate dynamic responses\n- Trigger a parallel automation (Slack message, calendar invite, etc.)\n\n#### 👉 [Reach out to us](mailto:hello@agentstudio.io) if you're interested in **analyzing your Retell Agent conversations**.\n"
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"check-out-date": "2025-03-30",
"number-of-nights": 1,
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"content": "Good day, and welcome to Agent Studios. I'm Luigi, and I'm here to assist you with your reservation. May I have your name and email address, please?"
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"word": "which ",
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},
{
"name": "send_email_confirmation",
"role": "tool_call_invocation",
"arguments": "{\"room-type-booked\":\"Deluxe Suite\",\"number-of-nights\":1,\"check-in-date\":\"2025-03-29\",\"check-out-date\":\"2025-03-30\",\"guest-name\":\"Mike Smith\",\"total-cost\":\"190\",\"hotel-name\":\"Agent Studios\"}",
"tool_call_id": "ae23cddc1dec67cf"
}
],
"retell_llm_dynamic_variables": {}
},
"name": "send_email_confirmation"
},
"query": {},
"params": {},
"headers": {
"host": "your-instance.app.n8n.cloud",
"accept": "application/json, text/plain, */*",
"cf-ray": "925f6cd523d6c77a-SEA",
"cdn-loop": "cloudflare; loops=1; subreqs=1",
"cf-ew-via": "15",
"cf-worker": "n8n.cloud",
"x-real-ip": "100.20.5.228",
"cf-visitor": "{\"scheme\":\"https\"}",
"user-agent": "axios/1.7.7",
"cf-ipcountry": "US",
"content-type": "application/json",
"x-is-trusted": "yes",
"content-length": "12572",
"accept-encoding": "gzip, br",
"x-forwarded-for": "100.20.5.228, 172.71.147.101",
"cf-connecting-ip": "100.20.5.228",
"x-forwarded-host": "your-instance.app.n8n.cloud",
"x-forwarded-port": "443",
"x-forwarded-proto": "https",
"x-forwarded-server": "traefik-prod-users-gwc-44-68df68bcf-shrw2",
"x-retell-signature": "v=1742916370585,d=f2a2305f630c02e30127dabb9db80a9756c0ed03318245e5c4b5745620ac7b72"
},
"webhookUrl": "https://your-instance.app.n8n.cloud/webhook/hotel-retell-template",
"executionMode": "production"
}
]
},
"connections": {
"Webhook": {
"main": [
[
{
"node": "6ebeaeb7-4ec5-4f5d-b8d5-3fd51ca8604c",
"type": "main",
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}
]
]
},
"6ebeaeb7-4ec5-4f5d-b8d5-3fd51ca8604c": {
"main": [
[
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"type": "main",
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}
]
]
}
}
}Häufig gestellte Fragen
Wie verwende ich diesen Workflow?
Kopieren Sie den obigen JSON-Code, erstellen Sie einen neuen Workflow in Ihrer n8n-Instanz und wählen Sie "Aus JSON importieren". Fügen Sie die Konfiguration ein und passen Sie die Anmeldedaten nach Bedarf an.
Für welche Szenarien ist dieser Workflow geeignet?
Fortgeschritten - Support, Künstliche Intelligenz, IT-Betrieb
Ist es kostenpflichtig?
Dieser Workflow ist völlig kostenlos. Beachten Sie jedoch, dass Drittanbieterdienste (wie OpenAI API), die im Workflow verwendet werden, möglicherweise kostenpflichtig sind.
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@agentstudioWe are a product studio that helps organizations leverage no-code and generative AI to automate internal processes and launch new digital products. LinkedIn: https://www.linkedin.com/in/baptistej/
Externe Links
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