Justcall MCP Server

@saaslabsco

Basic information

About 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.

#messaging#calling#cloud-phone#communication

Justcall MCP Server config

Add this server to your MCP-compatible client using the configuration below.

{
  "mcpServers": {
    "justcall": {
      "url": "https://mcp.justcall.host/mcp",
      "headers": {
        "Authorization": "Bearer <JUSTCALL_API_KEY>:<JUSTCALL_API_SECRET>"
      }
    }
  }
}

Justcall MCP Server tools

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Overview

What is JustCall MCP Server?

JustCall MCP Server lets Large Language Models (LLMs) and AI agents make real-world voice calls and send SMS directly through JustCall’s APIs, providing a function-calling interface for conversational AI systems.

How to use JustCall MCP Server?

Install Node.js, then configure your MCP client (e.g., Claude Desktop) by adding the server details to its config file using your JustCall API key and secret. For remote access, connect via Streamable HTTP Transport to https://mcp.justcall.host/mcp with bearer token authentication.

Key features of JustCall MCP Server

AI-powered calling: initiate, manage, or transcribe calls
Smart messaging: send or respond to SMS within conversations
Seamless integration with any LLM runtime via MCP standard
Secure authentication using JustCall API key and secret
Remote connection via Streamable HTTP Transport

Use cases of JustCall MCP Server

Enable your AI chatbot to place outbound voice calls to customers
Let an AI agent send or reply to SMS during a conversation
Integrate telephony capabilities into orchestration frameworks and LLM runtimes

Frequently asked questions

What are the prerequisites to run the server?

You need Node.js (which includes npm and npx) installed on your system. The LTS version is recommended.

How do I authenticate with JustCall MCP Server?

Get your JustCall API key and secret from the JustCall dashboard at `https://app.justcall.io/app/developersApiCredentials`. Include them as a bearer token in the request headers, for example `Authorization: <JUSTCALL_API_KEY>:<JUSTCALL_API_SECRET>`.

How do I connect to the remote MCP server?

Connect to `https://mcp.justcall.host/mcp` from any MCP client using Streamable HTTP Transport, and include your JustCall API key as a bearer token.

What transport does the remote server use?

The recommended and default transport is Streamable HTTP. You can also use the `supergateway` npx command with the `--streamableHttp` flag.

Can I develop or test the server locally?

Yes, clone the repository, install dependencies with `pnpm install`, build with `pnpm run build`, and test using `pnpm run inspector`.

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