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AlterPhone MCP

Official registry Other

Place real phone calls and hold spoken conversations on a user's behalf, billed per minute.

Source code Website Documentation

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http alterphone-mcp 'https://mcp.alterphone.app/mcp'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "alterphone-mcp": {
            "type": "http",
            "url": "https://mcp.alterphone.app/mcp"
        }
    }
}

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. AlterPhone MCP
  2. Quick start
  3. Tools
  4. Safety and limits
  5. For developers
  6. Support
  7. License

AlterPhone MCP

Let your AI assistant make real phone calls.

AlterPhone MCP is a hosted Model Context Protocol server. Connect it to Claude, ChatGPT, Cursor, Claude Code or any other MCP client, and the assistant can dial a real phone number, hold a spoken conversation in one of 12 languages, and report back what was said: book or reschedule appointments, ask a business a question, negotiate, confirm an order, screen a caller, run a survey.

  • Server URL: https://mcp.alterphone.app/mcp (Streamable HTTP)
  • Registry name: app.alterphone/phone-calls in the official MCP Registry
  • Auth: OAuth 2.1 with PKCE and dynamic client registration. Sign in with Google or Apple on first use.
  • Billing: prepaid credits, 100 credits per US dollar, per started minute at the destination rate (about 8 credits per minute to the US). Same account and balance as the AlterPhone app.

Full details, tools and supported countries: https://alterphone.app/mcp.html

Quick start

Claude (claude.ai and Claude Desktop)

Settings → Connectors → Add custom connector → enter https://mcp.alterphone.app/mcp → complete the sign-in.

ChatGPT

Settings → Connectors → create a connector with the server URL https://mcp.alterphone.app/mcp → complete the sign-in. Custom MCP connectors require developer mode on your plan.

Claude Code
claude mcp add --transport http -s user alterphone https://mcp.alterphone.app/mcp
Cursor, Windsurf and other clients with an MCP config file
{
  "mcpServers": {
    "alterphone": {
      "url": "https://mcp.alterphone.app/mcp"
    }
  }
}
Clients that only run local (stdio) servers

This package is a thin bridge for that case. It delegates to mcp-remote, which performs the browser sign-in, caches the tokens locally and forwards every message to the hosted server:

{
  "mcpServers": {
    "alterphone": {
      "command": "npx",
      "args": ["-y", "alterphone-mcp"]
    }
  }
}

Requires Node.js 18 or newer. Set ALTERPHONE_MCP_URL to point the bridge at a different server.

Tools

ToolDescription
have_conversationDial a number and pursue an objective autonomously. Streams the transcript and returns the collected answers and a summary. The main tool.
place_callDial a number, optionally with a greeting, for turn-by-turn control.
speak_and_listenSay something and return what the other party replied.
listenWait for the other party to speak and return the transcript.
hangupEnd the call.
get_balanceRead the prepaid credit balance.
purchase_creditsTop up with the saved payment method, within a daily cap.

Every tool carries readOnlyHint / destructiveHint annotations.

Safety and limits

  • Outbound calls only, to the US, Canada, the UK, Germany, France, Italy, Spain, the Netherlands, Belgium, Portugal, Poland, Romania, Turkey, Russia, India, Australia, Saudi Arabia, the UAE, Egypt, Morocco, Algeria, Tunisia and Libya.
  • Emergency, premium-rate and satellite numbers are refused before dialing. Conversation plans are screened for fraud, harassment, impersonation and other prohibited uses.
  • One active call per account. Transcripts are kept for 24 hours; see section 12 of the privacy policy.

For developers

Support

support@alterphone.app · Terms of service

License

MIT

Frequently asked questions

What is AlterPhone MCP?

Place real phone calls and hold spoken conversations on a user's behalf, billed per minute.

How do I install AlterPhone MCP?

It runs as a remote server. In Claude Code: claude mcp add --transport http alterphone-mcp 'https://mcp.alterphone.app/mcp'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does AlterPhone MCP need an API key?

Its registry entry lists no required key or secret. Some features may still need an account with the service it connects to.

Is AlterPhone MCP open source?

Yes. Its code is on GitHub under the MIT license.

Who maintains AlterPhone MCP?

It is published by marius-bardan. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.