JustCall MCP Server

The JustCall Model Context Protocol (MCP) Server lets Large Language Models (LLMs) and AI agents make real-world voice calls and send SMS directly through JustCall’s APIs — securely, contextually, and programmatically.

It provides a function-calling interface for conversational AI systems, enabling:

📞 AI-powered calling: Let your LLM initiate, manage, or transcribe calls using JustCall.
💬 Smart messaging: Allow your AI agent to send or respond to SMS within conversations.
⚙️ Seamless integration: Use the MCP standard to connect JustCall’s telephony capabilities with any LLM runtime or orchestration framework.

In short: It gives your LLMs a voice and a phone number — turning chatbots into truly conversational agents.

Claude Desktop Setup

Open Claude Desktop and press CMD + , to go to Settings.
Click on the Developer tab.
Click on the Edit Config button.
This will open the claude_desktop_config.json file in your file explorer.
Get your JustCall API Key & Secret from the JustCall dashboard (https://app.justcall.io/app/developersApiCredentials).
Add the following to your claude_desktop_config.json file. See here for more details.
Restart the Claude Desktop after editing the config file.

Remote Configuration

{ "mcpServers": { "JustCall-mcp": { "command": "npx", "args": [ "-y", "supergateway", "--streamableHttp", "https://mcp.justcall.host/mcp", "--oauth2Bearer", "<JUSTCALL_API_KEY>:<JUSTCALL_API_SECRET>" ] } } }

Remote MCP

To connect to JustCall's MCP server remotely:

Streamable HTTP (Recommended)

The default and recommended way to connect is via Streamable HTTP Transport:

Connect to https://mcp.justcall.host/mcp from any MCP client using Streamable HTTP Transport
Include your JustCall API key as a bearer token in the request headers
Example header: Authorization: <JUSTCALL_API_KEY>:<JUSTCALL_API_SECRET>

Development

# Install dependencies pnpm install # Build the server pnpm run build # Use inspector to test the server pnpm run inspector

Update your claude_desktop_config.json to use the mcp server.

This server cannot be installed

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security - not tested

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remote-capable server

The server can be hosted and run remotely because it primarily relies on remote services or has no dependency on the local environment.

Enables integration with JustCall APIs through function calling for managing telephony and communication services. Allows users to interact with JustCall's phone system capabilities through natural language using secure API authentication.

JustCall MCP Server

JustCall MCP Server

Claude Desktop Setup

Remote Configuration

Remote MCP

Streamable HTTP (Recommended)

Development

New MCP Servers

MCP directory API