n8n Voice AI Chatbot Workflow: ElevenLabs + Knowledge Experts

Turn voice questions into guided AI answers inside your n8n — using ElevenLabs, a LangChain Agent, and Knowledge Experts.

This n8n workflow lets you receive a request via Webhook, send it to a LangChain Agent backed by OpenAI Chat (n8nn8n-nodes-langchainlm chat open ai), and return the generated response through a respond to webhook step—built specifically for voice-first experiences when paired with ElevenLabs and Knowledge Experts.

What this workflow does

• Accepts incoming requests using the webhook trigger.
• Uses a LangChain Agent (n8nn8n-nodes-langchainagent) to interpret the user’s prompt and coordinate tool/knowledge usage.
• Calls out to external services where needed via the HTTP Request Tool to support voice AI behavior with ElevenLabs and knowledge handling with Knowledge Experts.
• Generates the final response using n8nn8n-nodes-langchainlm chat open ai.
• Sends the output back to the caller with respond to webhook, enabling seamless integration into your app or UI.

Use cases

• Voice customer support: capture spoken questions and return an AI-assisted answer through an API-driven interface.
• SaaS helpdesk Q&A: answer common onboarding and troubleshooting queries with knowledge-driven responses.
• Internal operations assistant: let staff ask questions verbally and receive structured guidance quickly.
• Prototype-to-production voice bot: validate voice AI flows using n8n webhooks before scaling.

Technical details

• Webhook + respond to webhook for API-ready request/response.
• n8nn8n-nodes-langchainagent to orchestrate reasoning and tool use.
• HTTP Request Tool to integrate external voice/knowledge services.
• n8nn8n-nodes-langchainlm chat open ai for conversational generation.
• Sticky note elements for workflow clarity and maintainability.

Designed for n8n automation engineers and SaaS operators who want an SEO-friendly, production-oriented n8n Voice AI Chatbot workflow leveraging ElevenLabs and Knowledge Experts.