phonecall-mcp

An MCP server that enables Claude to make and manage real phone calls through Twilio. Claude becomes the brain behind the conversation — thinking, searching, and responding — while the phone is just an I/O channel.

What makes this different? Most phone AI solutions put a pre-prompted, standalone agent on the line. Here, your full Claude instance — with all its tools (web search, calendar, Drive, email, etc.) — handles the call. It's not a script-following bot, but a reflective assistant that adapts to the conversation in real time.

Claude Desktop (MCP client)
    ↕ MCP protocol (stdio)
phonecall-mcp server (Python, local)
    ↕ WebSocket (Twilio Media Streams)
Twilio (PSTN telephone network)
    ↕
Callee's phone

Parallel services:

phonecall-mcp server
    → ElevenLabs Scribe v2 Realtime (STT: speech → text)
    → ElevenLabs TTS (text → speech)

The entire audio pipeline runs natively in μ-law 8kHz — no format conversion needed.

• Outbound calls — Claude initiates calls on your behalf, with natural TTS voice
• Real-time transcription — ElevenLabs Scribe v2 transcribes the callee's speech live
• GDPR consent — Built-in consent mechanism: no transcription occurs until the callee explicitly agrees (DTMF "5"). Enforced at the server level.
• DTMF turn-taking — Callee presses "1" when done speaking, press "1" to interrupt (barge-in)
• Tool use during calls — Claude can search the web, check calendars, look up documents — all while the callee hears a hold tone
• Inbound voicemail — Incoming calls are handled as a voicemail recorder
• Multi-language — Works in any language supported by ElevenLabs (tested: Hungarian, English, German)
• Full transcript — Every call produces a timestamped transcript with speaker labels

• Python 3.12+
• Twilio account with a phone number (console.twilio.com)
• ElevenLabs account with