How do I install the voice call mcp server?

Use a recorded configuration for your client, replace example credential values and paths, and verify the documented runtime. Restart or reconnect the client, then inspect the available tools.

What credentials does it need?

It reads `TWILIO_ACCOUNT_SID`, `TWILIO_AUTH_TOKEN`, `TWILIO_NUMBER`, `OPENAI_API_KEY`, `NGROK_AUTHTOKEN` from the environment. Store these in your client's env block or a secrets manager — never commit them to a repository — and grant the narrowest scope that still covers your use case.

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Voice Call MCP Server

A Model Context Protocol (MCP) server that enables Claude and other AI assistants to initiate and manage voice calls using Twilio and OpenAI (GPT-4o

Local serverstdio

What is the Voice Call MCP Server?

A Model Context Protocol (MCP) server that enables Claude and other AI assistants to initiate and manage voice calls using Twilio and OpenAI (GPT-4o Realtime model).

What you get

Make outbound phone calls via Twilio 📞
Process call audio in real-time with GPT-4o Realtime model 🎙️
Real-time language switching during calls 🌐
Pre-built prompts for common calling scenarios (like restaurant reservations) 🍽️
Automatic public URL tunneling with ngrok 🔄
Secure handling of credentials 🔒

Configuration and credentials

Node.js >= 22 - If you need to update Node.js, we recommend using nvm (Node Version Manager): - Twilio account with API credentials - OpenAI API key - Ngrok Authtoken

More MCP options

Compare MCP servers by category, or browse hosted MCP servers if you prefer an endpoint over a local process.

Maintainer setup documentation.

How to install the Voice Call MCP Server

{
  "mcpServers": {
    "voice-call": {
      "command": "node",
      "args": [
        "/path/to/your/mcp-new/dist/start-all.cjs"
      ],
      "env": {
        "TWILIO_ACCOUNT_SID": "your_account_sid",
        "TWILIO_AUTH_TOKEN": "YOUR_TWILIO_AUTH_TOKEN",
        "TWILIO_NUMBER": "your_e.164_format_number",
        "OPENAI_API_KEY": "YOUR_OPENAI_API_KEY",
        "NGROK_AUTHTOKEN": "YOUR_NGROK_AUTHTOKEN"
      }
    }
  }
}

From the project documentation. Replace placeholders and example paths before connecting.

Configuration

Node.js >= 22 - If you need to update Node.js, we recommend using nvm (Node Version Manager): - Twilio account with API credentials - OpenAI API key - Ngrok Authtoken

Variable	Description	Required
TWILIO_ACCOUNT_SID	Declared in the maintainer’s client configuration.	Check documentation
TWILIO_AUTH_TOKEN	Declared in the maintainer’s client configuration.	Check documentation
TWILIO_NUMBER	Declared in the maintainer’s client configuration.	Check documentation
OPENAI_API_KEY	Declared in the maintainer’s client configuration.	Check documentation
NGROK_AUTHTOKEN	Declared in the maintainer’s client configuration.	Check documentation

Example prompts to try

“Use Voice Call to Real.”
“Use Voice Call to Pre.”
“Use Voice Call to TWILIO ACCOUNT SID.”

Frequently asked questions

A Model Context Protocol (MCP) server that enables Claude and other AI assistants to initiate and manage voice calls using Twilio and OpenAI (GPT-4o Realtime model). Confirm the tools offered by your installed version in the connected client. Tool availability and permissions depend on the server and account configuration.