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Communication · Voice Processing

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Callcenter.js MCP

gerkensm/callcenter.js-mcp

An MCP Server, CLI tool, and API that makes phone calls on your behalf using VoIP.

View on GitHub

Install

npx github:gerkensm/callcenter.js-mcp --mcp

Client configuration

{
  "mcpServers": {
    "callcenter.js": {
      "command": "npx",
      "args": [
        "github:gerkensm/callcenter.js-mcp",
        "--mcp"
      ],
      "env": {
        "SIP_USERNAME": "<SIP_USERNAME>",
        "SIP_PASSWORD": "<SIP_PASSWORD>",
        "SIP_SERVER_IP": "<SIP_SERVER_IP>",
        "OPENAI_API_KEY": "<OPENAI_API_KEY>",
        "USER_NAME": "<USER_NAME>"
      }
    }
  }
}

Environment variables

SIP_USERNAMESIP_PASSWORDSIP_SERVER_IPOPENAI_API_KEYUSER_NAMESIP_PROVIDEROPENAI_VOICE
Author
@gerkensm
Category
Communication, Voice Processing
License
MIT
Updated
Oct 6, 2026

About Callcenter.js MCP

Just tell Claude what you want to accomplish, and it will call and handle the conversation for you. This is essentially an MCP Server that bridges between OpenAI's Real-Time Voice API and your VoIP connection to call people on your behalf.

Features

  • Multiple Codec Support: G.722 wideband (16kHz) + G.711 fallback for broad compatibility

  • Compiler-Free WASM Codec: Ships with a prebuilt G.722 WebAssembly module so npx users get wideband audio without installing build tools (native addon still available for max performance)

  • AI-Powered Conversations: Uses OpenAI's Real-Time Voice API with the latest gpt-realtime model (released August 28, 2025) for actual calls, with o3-mini model for instruction generation

  • Automatic Language Detection: Intelligently detects conversation language from call briefs and configures transcription accordingly

  • Auto Voice Selection: New 'auto' mode where o3-mini selects optimal voice based on call context (formality, industry, goals)

  • Voice Characteristics: Full support for all 10 OpenAI Realtime API voices with gender and personality awareness

  • Expanded SIP Support: Configurations for common SIP providers (Fritz!Box tested, others experimental)

  • Smart Configuration: Auto-detects provider requirements and optimizes settings

  • Enterprise-Ready: Supports advanced SIP features (STUN/TURN, session timers, transport fallback)

  • Robust Connection Management: Automatic reconnection with intelligent error handling

Details on this page are taken from the project's README. Open README

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