# CallCenter.js VoIP Telephony

> Use this tool when you need to automate phone-based customer service or enable AI agents to conduct natural voice conversations over traditional phone networks. It solves problems such as manual call handling and booking systems by providing a VoIP telephony infrastructure with high-quality voice transmission and intelligent call brief processing. With inputs including simple text descriptions and outputs of detailed AI agent instructions, it is ideal for businesses seeking to streamline phone-based interactions using AI-powered VoIP agents.

Canonical page: https://skillsregistry.net/skills/gerkensm-callcenter-js-voip-telephony  
JSON: https://api.skillsregistry.net/v1/skills/gerkensm-callcenter-js-voip-telephony

## Description

AI-powered VoIP agent system built by Torben Gerkensmeyer that enables making phone calls with OpenAI's real-time voice API through SIP-based telephony infrastructure. The implementation features native G.722 wideband audio codec support for high-quality voice transmission, comprehensive SIP provider profiles for Fritz!Box, Asterisk, Cisco CUCM, and 3CX systems, and intelligent call brief processing that converts simple text descriptions into detailed AI agent instructions using a meta-prompt system. Built with TypeScript and Node.js native addons, it includes advanced features like automatic transport fallback, connection management with provider-specific error handling, audio resampling between different sample rates, and performance monitoring, making it valuable for businesses automating phone-based customer service, appointment booking systems, or any scenario requiring AI agents to conduct natural voice conversations over traditional phone networks.

## Trust

- **Trust score (0–1):** 0.50
- **Verification tier:** unverified

## Facts

- **Version:** 1.0.0
- **Skill type:** atomic
- **Execution layer:** mcp-remote
- **Runtime environment:** api
- **Category:** media
- **Updated:** 2026-05-26

## Source

- **Source listing:** [PulseMCP](https://www.pulsemcp.com/servers/gerkensm-callcenter-js-voip-telephony)
- **Repository:** <https://github.com/gerkensm/callcenter.js-mcp>

## Use it

Resolve this record through the SkillsRegistry MCP server (no auth, read-only):

```
claude mcp add --transport http --scope user skillsregistry https://api.skillsregistry.net/mcp
```

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "get_skill",
    "arguments": {
      "slug": "gerkensm-callcenter-js-voip-telephony"
    }
  }
}
```

REST: `GET https://api.skillsregistry.net/v1/skills/gerkensm-callcenter-js-voip-telephony` · pull for local use: `GET https://api.skillsregistry.net/v1/skills/gerkensm-callcenter-js-voip-telephony/pull`

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