Voice Call MCP
A Model Context Protocol server that enables AI assistants like Claude to initiate and manage real-time voice calls using Twilio and OpenAI's voice models.
What is Voice Call MCP?
Voice Call MCP is a Model Context Protocol (MCP) server that allows AI assistants like Claude, Cursor, and VS Code to model context protocol server that enables ai assistants like claude to initiate and manage real-time voice calls using twilio and openai's voice models.
A Model Context Protocol server that enables AI assistants like Claude to initiate and manage real-time voice calls using Twilio and OpenAI's voice models.
This server falls under the Communication category on MCPgee, the world's largest MCP server directory with 33,000+ servers.
Features
- A Model Context Protocol server that enables AI assistants l
Use Cases
Maintainer
Works with
Installation
Manual Installation
npx voice-call-mcp-serverConfiguration
Configuration Details
claude_desktop_config.json
Performance
Response Metrics
Resource Usage
How to Set Up and Use Voice Call MCP
The Voice Call MCP Server enables AI assistants like Claude to initiate and manage real-time outbound phone calls by combining Twilio for telephony infrastructure with OpenAI's GPT-4o Realtime audio model for live voice interaction. It handles public URL tunneling via ngrok so no static server is required, supports mid-call language switching, and includes pre-built conversation templates for common scenarios like restaurant reservations and appointment scheduling.
Prerequisites
- Node.js 18 or higher installed
- A Twilio account with a phone number (TWILIO_ACCOUNT_SID, TWILIO_AUTH_TOKEN, TWILIO_NUMBER)
- An OpenAI API key with access to the GPT-4o Realtime model (OPENAI_API_KEY)
- An ngrok account and authtoken (NGROK_AUTHTOKEN) for public URL tunneling
- An MCP-compatible client such as Claude Desktop
Clone the repository
Clone the voice-call-mcp-server repository and navigate into it.
git clone https://github.com/popcornspace/voice-call-mcp-server.git
cd voice-call-mcp-serverInstall dependencies
Install all required Node.js packages.
npm installBuild the TypeScript server
Compile the TypeScript source to JavaScript before configuring your client.
npm run buildGather required credentials
Collect your Twilio Account SID, Auth Token, and phone number from https://console.twilio.com. Get your OpenAI API key from https://platform.openai.com. Get your ngrok authtoken from https://dashboard.ngrok.com/get-started/your-authtoken.
Configure Claude Desktop
Add the server to your claude_desktop_config.json with all required environment variables. The server will start ngrok automatically when Claude initiates a call.
Voice Call MCP Examples
Client configuration
Add this to your claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/claude_desktop_config.json). Replace all placeholder values with your real credentials.
{
"mcpServers": {
"voice-call": {
"command": "node",
"args": ["/path/to/voice-call-mcp-server/dist/index.js"],
"env": {
"TWILIO_ACCOUNT_SID": "ACxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
"TWILIO_AUTH_TOKEN": "your_twilio_auth_token",
"TWILIO_NUMBER": "+15551234567",
"OPENAI_API_KEY": "sk-...",
"NGROK_AUTHTOKEN": "your_ngrok_authtoken",
"RECORD_CALLS": "false"
}
}
}
}Prompts to try
Use these prompts in Claude to have it place voice calls on your behalf.
- "Call +1-555-123-4567 and let them know I'll be 15 minutes late to the meeting"
- "Please call Delicious Restaurant at +1-555-987-6543 and make a reservation for 4 people tonight at 7:30 PM"
- "Call Expert Dental NYC and reschedule my Monday appointment to next Friday between 4 and 6 PM"
- "Call +1-555-111-2222 and conduct the call in Spanish"Troubleshooting Voice Call MCP
ngrok tunnel fails to start
Verify your NGROK_AUTHTOKEN is correct by running `ngrok config add-authtoken <your_token>` manually. Ensure ngrok is not blocked by a firewall and that you do not have another ngrok session already running on a free tier account (free tier allows only one tunnel at a time).
Call connects but there is no audio or the AI does not respond
Confirm your OPENAI_API_KEY has access to the gpt-4o-realtime-preview model. This is a separate access tier from the standard GPT-4o API — check your OpenAI usage dashboard to confirm realtime API access is enabled.
Twilio error: 'from' number not verified or has no voice capability
In your Twilio console, confirm the phone number in TWILIO_NUMBER has voice capability enabled and that your Twilio account is fully verified. Trial accounts can only call verified numbers.
Frequently Asked Questions about Voice Call MCP
What is Voice Call MCP?
Voice Call MCP is a Model Context Protocol (MCP) server that model context protocol server that enables ai assistants like claude to initiate and manage real-time voice calls using twilio and openai's voice models. It connects AI assistants to external tools and data sources through a standardized interface.
How do I install Voice Call MCP?
Follow the installation instructions on the Voice Call MCP GitHub repository. Clone the repo, install dependencies, and add the server config to your AI client.
Which AI clients work with Voice Call MCP?
Voice Call MCP works with all major MCP-compatible AI clients including Claude Desktop, Claude Code, Cursor, VS Code (GitHub Copilot), Windsurf, and Cline.
Is Voice Call MCP free to use?
Yes, Voice Call MCP is open source and available under the MIT License license. You can use it freely in both personal and commercial projects.
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Browse More Communication MCP Servers
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