Sipflow MCP

SIP/VoIP/telecom grounding for AI agents. Vendor docs across ~40 stacks, 60+ RFCs, STIR/SHAKEN, trace and config analysis - every answer cites a verbatim source_url.

Sipflow is a hosted, read-only Model Context Protocol server. It gives your editor or agent ~20 tools that ground SIP/VoIP answers in a curated corpus instead of training-data recall.

• Live endpoint: https://mcp.sipflow.dev/mcp (Streamable HTTP)
• Web app: https://www.sipflow.dev
• Install page (one-click + all clients): https://www.sipflow.dev/tools/mcp

Install

Cursor (one-click)

Install Sipflow in Cursor

Or from the Cursor Marketplace. This repo also ships as a Cursor plugin with a bundled Skill and Rule (see What's in this repo below).

Cursor (manual) - ~/.cursor/mcp.json

{
  "mcpServers": {
    "sipflow": { "url": "https://mcp.sipflow.dev/mcp" }
  }
}

VS Code - .vscode/mcp.json or user settings.json

{
  "servers": {
    "sipflow": {
      "type": "http",
      "url": "https://mcp.sipflow.dev/mcp"
    }
  }
}

Requires VS Code 1.99+ with the GitHub Copilot extension.

Claude Desktop - claude_desktop_config.json

Claude Desktop is stdio-only, so use the mcp-remote shim:

{
  "mcpServers": {
    "sipflow": {
      "command": "npx",
      "args": ["-y", "mcp-remote", "https://mcp.sipflow.dev/mcp"]
    }
  }
}

Claude Code (CLI)

claude mcp add --transport http sipflow https://mcp.sipflow.dev/mcp

Codex CLI - ~/.codex/config.toml

[mcp_servers.sipflow]
url = "https://mcp.sipflow.dev/mcp"

Cline - Settings -> MCP Servers -> Edit JSON

{
  "mcpServers": {
    "sipflow": { "url": "https://mcp.sipflow.dev/mcp" }
  }
}

Continue - ~/.continue/config.yaml

mcpServers:
  - name: sipflow
    transport:
      type: streamable-http
      url: https://mcp.sipflow.dev/mcp

Windsurf - ~/.codeium/windsurf/mcp_config.json

{
  "mcpServers": {
    "sipflow": {
      "serverUrl": "https://mcp.sipflow.dev/mcp"
    }
  }
}

Goose - ~/.config/goose/config.yaml

extensions:
  sipflow:
    type: http
    uri: https://mcp.sipflow.dev/mcp
    enabled: true

Generic / curl smoke-test

curl -sS -X POST https://mcp.sipflow.dev/mcp \
  -H "Content-Type: application/json" \
  -H "Accept: application/json, text/event-stream" \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'

What's in this repo

File / Folder	Marketplace	Purpose
server.json	Official MCP Registry	Canonical server descriptor. PulseMCP auto-ingests from here.
smithery.yaml	Smithery	Remote HTTP listing.
.cursor-plugin/plugin.json	Cursor Marketplace	Plugin manifest.
mcp.json	Cursor plugin auto-discovery	Points the plugin at the remote endpoint.
skills/sip-debugger/	Cursor plugin	"When to use Sipflow" playbook surfaced as /sip-debugger.
rules/sip-grounding.mdc	Cursor plugin	Auto-attaches when editing .pcap, kamailio/opensips/freeswitch/asterisk configs, dialplans, .sdp.
assets/logo.svg	All	Logo.

The Cursor-specific files (.cursor-plugin/, mcp.json, skills/, rules/) are silently ignored by non-Cursor marketplaces - they only parse their own manifest.

Tool catalog

All tools are read-only. The only outbound IO is dns_diagnose_sip_target (DNS + TLS handshake) and validate_stir_shaken_identity (cert fetch).

Discovery / grounding - search_sip_docs, lookup_response_code, lookup_sip_header

Detection - detect_sip_stack, detect_sip_vendor_from_config

Traces - minimize_sip_trace, render_sip_ladder, sip_ladder_example, lint_sip_request, parse_sip_message, diff_sip_messages

Config review - review_sip_config, webrtc_sip_checklist

SDP - parse_sdp, compare_sdp_offer_answer

STIR/SHAKEN - validate_stir_shaken_identity, stir_attestation_explainer

Telecom - validate_e164_number, troubleshoot_response_code

Network - dns_diagnose_sip_target (rate-limited)

Share hydration - fetch_sipflow_share for sipflow.dev/share/<token> URLs

Resource - sipflow://docs/{vendor}/{id} for a single corpus chunk

Corpus coverage

• ~40 vendor stacks: Kamailio, OpenSIPS, FreeSWITCH, Asterisk (PJSIP + chan_sip), SIP.js, JsSIP, FreePBX, 3CX, OpenSER, Twilio, Cisco, ...
• 60+ RFCs: SIP, SDP, RTP, WebRTC core
• STIR/SHAKEN: RFC 8224/8225/8226/8588/9027/9795
• Branded calling: ATIS-1000074, ATIS-1000094, ATIS-1000084, CTIA BCID

Local development (Cursor plugin)

Test the plugin locally by symlinking this repo into Cursor's local plugin folder:

ln -s "$PWD" ~/.cursor/plugins/local/sipflow

Run Developer: Reload Window in Cursor. You should see:

• sipflow server in Settings -> Features -> Model Context Protocol
• sip-debugger skill under Settings -> Rules (Agent Decides)
• sip-grounding rule under Settings -> Rules

Submitting updates

When the MCP server changes, bump version in three places to keep registries in sync:

• server.json -> Official MCP Registry
• .cursor-plugin/plugin.json -> Cursor Marketplace
• The hosted server's serverInfo.version

Then re-run mcp-publisher publish for the Official Registry. Cursor, Smithery, and Glama auto-track the default branch.

License

MIT - see LICENSE.