Replace your call center with an AI agent using GoHighLevel (GHL), VAPI & Twilio

The AI Calling Agent is a fully automated phone assistant built with n8n, GoHighLevel (GHL), VAPI, and Twilio.
This workflow allows you to:

• Trigger outbound calls from your CRM (GHL).
• Use a voice AI assistant (VAPI) to talk with leads in real time.
• Route calls through Twilio.
• Save appointments and full conversation summaries directly in GHL.

It has been tested on real warm leads (not random numbers) and proven stable at up to 300 calls/day without interruption.
Instead of manually calling and qualifying each lead, let the agent do it automatically and focus only on booked calls.

Workflow in Action

Appointment booking

• The agent can confirm appointments and save them directly in your GHL calendar, along with the summary of the conversation.

Agent performance

• You can monitor conversations, call logs, and outcomes directly in the VAPI dashboard.

Agent working live

• Proof that the agent can run non-stop for hundreds of calls per day without errors or interruptions.
• Demonstrates reliability and stability even under continuous execution.

Contact statuses

• Each contact in GHL receives a status tag depending on the call result: answered, invalid number, no response, etc. This ensures your pipeline stays clean and updated automatically.

The brain of the agent

• Inside VAPI, every assistant is powered by a command system (the brain) where you define how it should behave during calls.
• In this case, the brain is propelled by OpenAI, but VAPI also supports a wide range of AI models such as Anthropic Claude, Google Gemini, Mistral, LLaMA and more.
• The same flexibility applies to voices: you can instantly switch between integrated providers like ElevenLabs, Play.ht, Microsoft Azure Voices, Google Cloud TTS, and others.
• This makes the agent not only smart but also highly customizable - from the intelligence driving the conversation to the exact voice your clients will hear.

Required APIs

To run this workflow, you need the following:

• VAPI API key → for the voice AI assistant logic.
• Twilio API key → to provide phone numbers and route calls.
• GoHighLevel (GHL) API key → to manage contacts, pipelines, and save appointments.

Setup Steps

1. Generate API keys for VAPI, Twilio, and GHL.
2. Import the n8n template into your environment.
3. Configure credentials in n8n for each API.
4. Set your trigger conditions in GHL (e.g., pipeline stage changes, new leads).
5. Test the workflow with a warm lead before scaling.
6. (Optional) Adjust logging or sync results with Google Sheets/Notion.

💡 Use Cases

• Sales Teams: Automatically call new inbound leads, qualify them, and book appointments.
• Agencies: Replace repetitive cold calling with an automated assistant, then hand over only the hot leads to human agents.
• Real Estate: Pre-qualify potential buyers or renters, schedule viewings, and save results in GHL.
• Healthcare/Clinics: Confirm appointments, send reminders, and reduce no-shows with an AI calling agent.
• Education/Coaching: Handle inquiries for courses, book consultations, and sync data with your CRM.
• Inbound Calls: The agent can also be configured to answer incoming phone calls, providing information, capturing lead details, or routing the caller to the right person.

With this template, you get a scalable AI-powered sales assistant that saves hours of manual calling while ensuring every lead gets a fast, professional response.

Links

• 📂 GitHub
• 📰 Medium Article
• ▶️ YouTube Lite Version – simplified version using Google Sheets only