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justcall-mcp-server

justcall-mcp-server

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This server lets your AI assistant make phone calls and send SMS messages using your JustCall account. You can connect it easily in apps like Claude and ChatGPT by adding a connector and entering your JustCall API credentials. Once set up, your AI can handle calls, texts, transcriptions, and contact management, making conversations more natural and hands-free.

Communication
Other

Use This MCP server To

Make phone calls through my AI assistant Send and receive SMS messages via AI chat Get call transcriptions and details Manage contacts and call notes Check recent SMS replies Update user availability for calls View call analytics and reports

README

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

  1. Open Claude Desktop and press CMD + , to go to Settings.
  2. Click on the Connectors tab.
  3. Click on the Add Custom Connector button.
  4. Add name as JustCall and Remote Server Url as https://mcp.justcall.host/mcp.
  5. Now on JustCall from the Connectors list click on Connect button for JustCall.
  6. It will open a JustCall page requesting API key and secret.
  7. Get your JustCall API Key & Secret from the JustCall dashboard (https://app.justcall.io/app/developersApiCredentials).
  8. Enter the API key and Secret and press Continue, it should redirect back you to Claude.

Claude Web - https://claude.ai

  1. Open connectors url in your Browser - https://claude.ai/settings/connectors.
  2. Click on the Connectors tab.
  3. Click on the Add Custom Connector button.
  4. Add name as JustCall and Remote Server Url as https://mcp.justcall.host/mcp.
  5. Now on JustCall from the Connectors list click on Connect button for JustCall.
  6. It will open a JustCall page requesting API key and secret.
  7. Get your JustCall API Key & Secret from the JustCall dashboard (https://app.justcall.io/app/developersApiCredentials).
  8. Enter the API key and Secret and press Continue, it should redirect back you to Claude.

Chat GPT (Only available on Plus, Pro, Business and Enterprise)

  1. Open connectors url in your Browser - https://chatgpt.com/#settings/Connectors.
  2. Click on the Apps & Connectors tab.
  3. Ensure developer mode is enabled in advanced settings
  4. Click on the Create button.
  5. Add name as JustCall and MCP Server Url as https://mcp.justcall.host/mcp. You can skip other fields.
  6. Now on JustCall from the Connectors list click on Connect button for JustCall.
  7. It will open a JustCall page requesting API key and secret.
  8. Get your JustCall API Key & Secret from the JustCall dashboard (https://app.justcall.io/app/developersApiCredentials).
  9. Enter the API key and Secret and press Continue, it should redirect back you to Chat GPT.

justcall-mcp-server FAQ

Can I use this to make phone calls and send SMS through my AI assistant?
Yes — this server lets your AI place calls and send text messages using JustCall, directly from apps like Claude and ChatGPT.
Does this work with ChatGPT and Claude?
Yes — it integrates with Claude.ai, Claude Desktop, and ChatGPT (Plus, Pro, Business, Enterprise).
Do I need a JustCall account or API key?
Yes — you must have a JustCall API key and secret, which you enter during setup.
Is setup complicated?
No — setup is one-click or simple URL configuration in your AI app’s connector settings.
How do I connect it in Claude Desktop?
Add a custom connector named JustCall with URL https://mcp.justcall.host/mcp, then enter your API key and secret when prompted.
Is my data secure?
Yes — it uses OAuth2 and token authentication to keep your calls and messages safe.