AlterPhone MCP

app.alterphonePublished by alterphone.appOfficial publisherv1.0.1Updated Oct 24, 2026

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

VerifiedStreamable HTTPWeb executableProductivity & WorkflowCommunication & Collaboration

Overview

AI-generated overview

Hosted MCP server that lets an assistant place real outbound phone calls, hold spoken conversations in 12 languages, and report back what was said.

What you can do
  • Dial numbers and run an autonomous conversation toward an objective, returning transcript, answers and a summary
  • Place a call and control it turn by turn: speak, listen, and hang up
  • Read the prepaid credit balance and top up credits with the saved payment method
  • Use cases include booking or rescheduling appointments, asking a business a question, confirming an order, screening a caller and running surveys
When to use it
When an assistant should act by phone rather than by text: booking or changing appointments, asking a business a question, confirming an order, screening a caller or running a short survey in a supported country.
Requirements
Remote Streamable HTTP endpoint at mcp.alterphone.app/mcp; OAuth 2.1 with PKCE and dynamic client registration, signing in with Google or Apple on first use. Clients that only run local stdio servers need the npx bridge package and Node.js 18 or newer. Prepaid credits are required to call.
Before you install
Calls cost money: prepaid credits are charged per started minute at the destination rate, and the purchase_credits tool can top up using the saved payment method within a daily cap. The assistant dials real people and speaks on the user's behalf, so objectives and greetings should be reviewed; plans are screened for fraud, harassment and impersonation. Transcripts are kept for 24 hours. Only outbound calls to listed countries are allowed, one active call per account.

Installation

In SourceWeft

  1. Open AlterPhone MCP in the dashboard and add it to a workspace.
  2. Connect the required credentials. They are stored privately and never shown on public pages.
  3. Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Use with an agent

Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.

Read https://sourceweft.com/mcp/app.alterphone%2Fphone-calls/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.

Read the install guide the agent follows

Other MCP clients

Add this to your client's mcpServers config. The client completes OAuth sign-in on first connect.

{
  "mcpServers": {
    "alterphone": {
      "type": "http",
      "url": "https://mcp.alterphone.app/mcp"
    }
  }
}

README

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

bash
claude mcp add --transport http -s user alterphone https://mcp.alterphone.app/mcp

Cursor, Windsurf and other clients with an MCP config file

json
{  "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:

json
{  "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

[email protected] · Terms of service

License

MIT

Source: README.md at commit c03aadf

Tools

0
This server asks you to sign in, so SourceWeft could not read its tools without an account and has not indexed them. What a connected account sees can depend on that account and its permissions.

Version history

2
  1. v1.0.1LatestSep 16, 2026
  2. v1.0.0Sep 16, 2026

Score

85% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 daysRequired25 pts
  • Auth declaredRequired10 pts
  • Tools listed15 pts

    Answer tools/list without a credential, or ship a package that starts in a sandbox without one.

  • DescriptionRequired15 pts
  • Logo10 pts
  • Documentation15 pts
  • License10 pts