$ -weight: 500;">curl -s -X POST https://api.voipbin.net/v1.0/auth/signup \ -H "Content-Type: application/json" \ -d '{ "username": "your-username", "password": "your-password", "email": "[email protected]", "name": "Your Name" }' -weight: 500;">curl -s -X POST https://api.voipbin.net/v1.0/auth/signup \ -H "Content-Type: application/json" \ -d '{ "username": "your-username", "password": "your-password", "email": "[email protected]", "name": "Your Name" }' -weight: 500;">curl -s -X POST https://api.voipbin.net/v1.0/auth/signup \ -H "Content-Type: application/json" \ -d '{ "username": "your-username", "password": "your-password", "email": "[email protected]", "name": "Your Name" }' uvx voipbin-mcp uvx voipbin-mcp uvx voipbin-mcp # macOS open ~/Library/Application\ Support/Claude/claude_desktop_config.json # Windows notepad %APPDATA%\Claude\claude_desktop_config.json # macOS open ~/Library/Application\ Support/Claude/claude_desktop_config.json # Windows notepad %APPDATA%\Claude\claude_desktop_config.json # macOS open ~/Library/Application\ Support/Claude/claude_desktop_config.json # Windows notepad %APPDATA%\Claude\claude_desktop_config.json { "mcpServers": { "voipbin": { "command": "uvx", "args": ["voipbin-mcp"], "env": { "VOIPBIN_API_KEY": "your-api-key-here" } } } } { "mcpServers": { "voipbin": { "command": "uvx", "args": ["voipbin-mcp"], "env": { "VOIPBIN_API_KEY": "your-api-key-here" } } } } { "mcpServers": { "voipbin": { "command": "uvx", "args": ["voipbin-mcp"], "env": { "VOIPBIN_API_KEY": "your-api-key-here" } } } } Claude Desktop │ │ MCP tool call: make_call(to="+1555...", message="Hello...") ▼ VoIPBin MCP Server │ │ REST API → https://api.voipbin.net/v1.0 ▼ VoIPBin Infrastructure │ ├─ Allocates real phone number (or uses Direct Hash SIP URI) ├─ Initiates SIP/RTP call to destination ├─ Converts your text → TTS audio ├─ Plays to recipient ├─ Captures response via STT └─ Returns transcript back to Claude Claude Desktop │ │ MCP tool call: make_call(to="+1555...", message="Hello...") ▼ VoIPBin MCP Server │ │ REST API → https://api.voipbin.net/v1.0 ▼ VoIPBin Infrastructure │ ├─ Allocates real phone number (or uses Direct Hash SIP URI) ├─ Initiates SIP/RTP call to destination ├─ Converts your text → TTS audio ├─ Plays to recipient ├─ Captures response via STT └─ Returns transcript back to Claude Claude Desktop │ │ MCP tool call: make_call(to="+1555...", message="Hello...") ▼ VoIPBin MCP Server │ │ REST API → https://api.voipbin.net/v1.0 ▼ VoIPBin Infrastructure │ ├─ Allocates real phone number (or uses Direct Hash SIP URI) ├─ Initiates SIP/RTP call to destination ├─ Converts your text → TTS audio ├─ Plays to recipient ├─ Captures response via STT └─ Returns transcript back to Claude You: "I just deployed the new onboarding flow. Can you call our test number +1-555-0199 and walk through the IVR to check if it's working?" Cursor: [calls the number, navigates the prompts, reports back] "Step 1 asked for language selection — I pressed 1 for English. Step 2 played the welcome message correctly. Step 3 transferred to the queue as expected." You: "I just deployed the new onboarding flow. Can you call our test number +1-555-0199 and walk through the IVR to check if it's working?" Cursor: [calls the number, navigates the prompts, reports back] "Step 1 asked for language selection — I pressed 1 for English. Step 2 played the welcome message correctly. Step 3 transferred to the queue as expected." You: "I just deployed the new onboarding flow. Can you call our test number +1-555-0199 and walk through the IVR to check if it's working?" Cursor: [calls the number, navigates the prompts, reports back] "Step 1 asked for language selection — I pressed 1 for English. Step 2 played the welcome message correctly. Step 3 transferred to the queue as expected." - Claude calls a customer to confirm an appointment it just scheduled - Your AI agent dials a support line on your behalf and navigates the IVR - You ask Cursor to make a test call to your new voice bot and report back what it heard - An automated flow places outbound calls when triggered by a database event - Claude reads a CRM export (a CSV of leads) - For each lead, it composes a personalized intro message - It uses VoIPBin MCP to place calls and deliver the message - It collects responses and updates the CRM - Free tier has call limits — check voipbin.net for current quotas - Outbound PSTN calls require a funded account for carrier costs - MCP tool availability depends on your Claude plan (Claude Pro and above support MCP) - Not all MCP clients support all tool types — test with your specific setup - VoIPBin API Docs — full reference for calls, SMS, flows, and agents - Golang SDK: go get github.com/voipbin/voipbin-go — if you want to build custom integrations - Direct Hash SIP URI — run an AI voice bot without a phone number at all (no carrier required)