Conectar el agente de voz Retell a una función personalizada
Intermedio
Este es unSupport, AI, IT Opsflujo de automatización del dominio deautomatización que contiene 7 nodos.Utiliza principalmente nodos como Set, Webhook, RespondToWebhook, combinando tecnología de inteligencia artificial para lograr automatización inteligente. Conectar el agente de voz Retell a una función personalizada
Requisitos previos
- •Punto final de HTTP Webhook (n8n generará automáticamente)
Nodos utilizados (7)
Vista previa del flujo de trabajo
Visualización de las conexiones entre nodos, con soporte para zoom y panorámica
Exportar flujo de trabajo
Copie la siguiente configuración JSON en n8n para importar y usar este flujo de trabajo
{
"meta": {
"instanceId": "f4f5d195bb2162a0972f737368404b18be694648d365d6c6771d7b4909d28167"
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"nodes": [
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"id": "693e094e-0329-455d-9c42-ba398dd40955",
"name": "Webhook",
"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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"typeVersion": 2
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{
"id": "6172b8b6-4950-4b7f-a60c-ce782139f24c",
"name": "Responder a Webhook",
"type": "n8n-nodes-base.respondToWebhook",
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"parameters": {
"options": {}
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"typeVersion": 1.1
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{
"id": "6ebeaeb7-4ec5-4f5d-b8d5-3fd51ca8604c",
"name": "[¡Reemplázame!] Establecer respuesta",
"type": "n8n-nodes-base.set",
"position": [
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"parameters": {
"options": {},
"assignments": {
"assignments": [
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"name": "response",
"type": "string",
"value": "Your booking has been confirmed!"
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}
},
"typeVersion": 3.4
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{
"id": "86c16dd4-0d9d-40bb-a495-02c1a2ac06f1",
"name": "Nota adhesiva",
"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": "Nota adhesiva2",
"type": "n8n-nodes-base.stickyNote",
"position": [
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"parameters": {
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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
},
{
"id": "94ec297f-aa00-4358-b1f9-834438548a19",
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"parameters": {
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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
},
{
"id": "baff741b-8cd3-4f7d-a56f-5029e1babc26",
"name": "Nota adhesiva1",
"type": "n8n-nodes-base.stickyNote",
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"parameters": {
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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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"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?"
},
{
"role": "user",
"words": [
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"end": 3,
"word": "My ",
"start": 3
},
{
"end": 3,
"word": "name ",
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"word": "Mike ",
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"word": "Smith, ",
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"content": "My name is Mike Smith, and my email address is mike@yahoo.com."
},
{
"role": "agent",
"words": [
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"end": 4,
"word": "Thank ",
"start": 4
},
{
"end": 4,
"word": "you, ",
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},
{
"end": 4,
"word": "Mike. ",
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{
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"word": "For ",
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"word": "stay ",
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{
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"word": "on ",
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{
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"word": "March ",
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},
{
"end": 4,
"word": "29th, ",
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"word": "we ",
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"word": "have ",
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"word": "the ",
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{
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"word": "Deluxe ",
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{
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"word": "Suite ",
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"word": "available, ",
"start": 4
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"word": "which ",
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{
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"word": "euros ",
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},
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"word": "per ",
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{
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"word": "night. ",
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{
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"word": "This ",
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{
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"word": "fits ",
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},
{
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"word": "within ",
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},
{
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"word": "your ",
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},
{
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"word": "budget ",
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},
{
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"word": "of ",
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},
{
"end": 4,
"word": "250 ",
"start": 4
},
{
"end": 4,
"word": "euros. ",
"start": 4
},
{
"end": 4,
"word": "Would ",
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},
{
"end": 4,
"word": "you ",
"start": 4
},
{
"end": 4,
"word": "like ",
"start": 4
},
{
"end": 4,
"word": "to ",
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},
{
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"word": "proceed ",
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{
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{
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{
"end": 4,
"word": "the ",
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{
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{
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{
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{
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"word": "one ",
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},
{
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"word": "night?",
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],
"content": "Thank you, Mike. For your stay on March 29th, we have the Deluxe Suite available, which is priced at 190 euros per night. This fits within your budget of 250 euros. Would you like to proceed with booking the Deluxe Suite for one night?"
},
{
"role": "user",
"words": [
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"word": "Yes, ",
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},
{
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},
{
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"word": "sounds ",
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{
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"word": "great! ",
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},
{
"end": 5,
"word": "Please ",
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},
{
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},
{
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{
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}
],
"content": "Yes, that sounds great! Please proceed with the booking for the Deluxe Suite for one night on March 29th."
},
{
"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": {
"693e094e-0329-455d-9c42-ba398dd40955": {
"main": [
[
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},
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}
}Preguntas frecuentes
¿Cómo usar este flujo de trabajo?
Copie el código de configuración JSON de arriba, cree un nuevo flujo de trabajo en su instancia de n8n y seleccione "Importar desde JSON", pegue la configuración y luego modifique la configuración de credenciales según sea necesario.
¿En qué escenarios es adecuado este flujo de trabajo?
Intermedio - Soporte, Inteligencia Artificial, Operaciones de TI
¿Es de pago?
Este flujo de trabajo es completamente gratuito, puede importarlo y usarlo directamente. Sin embargo, tenga en cuenta que los servicios de terceros utilizados en el flujo de trabajo (como la API de OpenAI) pueden requerir un pago por su cuenta.
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Información del flujo de trabajo
Nivel de dificultad
Intermedio
Número de nodos7
Categoría3
Tipos de nodos4
Descripción de la dificultad
Autor
Agent Studio
@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/
Enlaces externos
Ver en n8n.io →
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