Voice Call MCP Server
@MCP-Mirror
About Voice Call MCP Server
Mirror of
Config
Add this server to your MCP-compatible client using the configuration below.
{
"mcpServers": {
"voice-call": {
"command": "node",
"args": [
"/path/to/your/mcp-new/dist/start-all.cjs"
],
"env": {
"TWILIO_ACCOUNT_SID": "",
"TWILIO_AUTH_TOKEN": "",
"TWILIO_NUMBER": "",
"OPENAI_API_KEY": "",
"NGROK_AUTHTOKEN": ""
}
}
}
}Tools
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Overview
What is Voice Call MCP Server?
Voice Call MCP Server is a Model Context Protocol (MCP) server that enables Claude and other AI assistants to initiate and manage voice calls using Twilio and OpenAI’s GPT-4o Realtime model. It serves as a base for building AI-powered voice calling applications.
How to use Voice Call MCP Server?
Clone the repository, install dependencies (npm install && npm run build), and configure environment variables (Twilio credentials, OpenAI API key, ngrok authtoken). Add the server configuration to Claude Desktop’s claude_desktop_config.json, restart Claude, and you’ll see “Voice Call” under the hammer menu. Then invoke call tasks naturally, e.g., “Can you call +1-123-456-7890 and let them know I’ll be 15 minutes late?”
Key features of Voice Call MCP Server
- 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 scenarios (e.g., restaurant reservations)
- Automatic public URL tunneling with ngrok
- Secure handling of credentials
Use cases of Voice Call MCP Server
- Notify someone about a meeting delay via a simple phone call
- Make a restaurant reservation in a specified language
- Reschedule an appointment by speaking to a business
FAQ from Voice Call MCP Server
What are the requirements to run Voice Call MCP Server?
Node.js 22 or later, a Twilio account with API credentials, an OpenAI API key, and an ngrok authtoken. Using nvm to manage Node.js versions is recommended.
How do I configure Voice Call MCP Server for Claude Desktop?
Set environment variables for TWILIO_ACCOUNT_SID, TWILIO_AUTH_TOKEN, TWILIO_NUMBER, OPENAI_API_KEY, and NGROK_AUTHTOKEN in the claude_desktop_config.json file. Restart Claude Desktop to load the configuration.
What should I know about phone number format, limits, and costs?
Phone numbers must be in E.164 format (e.g., +11234567890). Be aware of Twilio and OpenAI account rate limits and pricing—call durations affect both services. The ngrok tunnel exposes your server publicly with a random URL and a random secret.
How is data handled and secured?
The server is open-source and designed for transparency and customizability. Credentials are stored securely in environment variables. No local database is included; real-time audio flows through Twilio and OpenAI. Call recording is optional via the RECORD_CALLS environment variable.
Frequently asked questions
What are the requirements to run Voice Call MCP Server?
Node.js 22 or later, a Twilio account with API credentials, an OpenAI API key, and an ngrok authtoken. Using nvm to manage Node.js versions is recommended.
How do I configure Voice Call MCP Server for Claude Desktop?
Set environment variables for `TWILIO_ACCOUNT_SID`, `TWILIO_AUTH_TOKEN`, `TWILIO_NUMBER`, `OPENAI_API_KEY`, and `NGROK_AUTHTOKEN` in the `claude_desktop_config.json` file. Restart Claude Desktop to load the configuration.
What should I know about phone number format, limits, and costs?
Phone numbers must be in E.164 format (e.g., +11234567890). Be aware of Twilio and OpenAI account rate limits and pricing—call durations affect both services. The ngrok tunnel exposes your server publicly with a random URL and a random secret.
How is data handled and secured?
The server is open-source and designed for transparency and customizability. Credentials are stored securely in environment variables. No local database is included; real-time audio flows through Twilio and OpenAI. Call recording is optional via the `RECORD_CALLS` environment variable.
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