Sinch Elastic SIP Trunking (EST) MCP Server

A Model Context Protocol (MCP) server for managing Sinch EST - enables AI assistants to manage SIP trunks, phone numbers, ACLs, and perform SIP call testing.

Requires Node.js >= 18

Quick Start

# Install globally from npm
npm install -g @sinch/est-mcp

# Or run directly with npx
npx @sinch/est-mcp

# Configure credentials
mkdir -p ~/.config/est-mcp
cat > ~/.config/est-mcp/credentials << 'EOF'
SINCH_PROJECT_ID=your-project-id
SINCH_ACCESS_KEY_ID=your-access-key-id
SINCH_ACCESS_KEY_SECRET=your-access-key-secret
EOF
chmod 600 ~/.config/est-mcp/credentials

Features

45 tools across 9 categories:

| Category | Tools | |----------|-------| | Trunks | list, get, create, update, delete | | Numbers | list active/available, rent, release, assign, unassign | | ACLs | list, create, update, delete, link to trunk | | Credentials | list, create, delete, link/unlink from trunk | | Endpoints | list, create, delete | | SIP Testing | OPTIONS ping, test call, audio stream, recording | | Loopback Testing | start loopback test, check loopback status, setup and test trunk | | Call Logs | list, get, filter by date/range/direction | | Compliance | Emergency addresses, country permissions | | Documentation | get_operator_guide — loads full EST context into the AI |

AI Context Injection

Start every session with:

get_operator_guide({})

This loads the complete Sinch EST mental model into context.

Example Use Cases

Set up a trunk:

"Create a trunk 'my-trunk' with hostname 'my-trunk'"

Test connectivity:

"Run a loopback test on trunk X with phone number +15551234567"

Receive calls:

"Set up a registered endpoint and wait for an inbound call"

Installation

Add to your MCP config (claude_desktop_config.json):

{
  "mcpServers": {
    "sinch-est": {
      "command": "npx",
      "args": ["-y", "@sinch/est-mcp"]
    }
  }
}

Resources

• Operator Guide - Complete mental model for AI assistants
• Changelog - Version history