Summary
Connects your AI agent to a curated corpus of SIP and VoIP documentation covering 40+ vendor stacks (Kamailio, FreeSWITCH, Asterisk, Twilio, Cisco), 60+ RFCs, and STIR/SHAKEN specs. Exposes about 20 read-only tools for searching vendor docs, parsing SIP messages and SDP, rendering ladder diagrams, linting traces, reviewing configs, validating E.164 numbers, and checking STIR/SHAKEN identity headers. Every answer cites a source URL from the corpus. Hosted at mcp.sipflow.dev/mcp over streamable HTTP, so no local setup. Reach for this when you're debugging WebRTC negotiation, troubleshooting response codes, reviewing dialplan configs, or need authoritative references instead of LLM recall on telecom protocols.
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Tools
Public tool metadata for what this MCP can expose to an agent.
21 tools
search_sip_docs[cost: rag (one embed + one vector search) | read-only, network: outbound to embed model only] Vector search over Sipflow's curated VoIP knowledge base: vendor docs (Asterisk, FreeSWITCH, Kamailio, OpenSIPS, Twilio, Cisco, etc.), SIP/SDP/WebRTC RFCs, STIR/SHAKEN material (RFC...4 params
[cost: rag (one embed + one vector search) | read-only, network: outbound to embed model only] Vector search over Sipflow's curated VoIP knowledge base: vendor docs (Asterisk, FreeSWITCH, Kamailio, OpenSIPS, Twilio, Cisco, etc.), SIP/SDP/WebRTC RFCs, STIR/SHAKEN material (RFC...
Parameters* required
limitintegerMaximum number of snippets to return (1-15).default: 5
querystringNatural-language question or keywords. Be specific - include vendor name, header, error code, module, or RFC if known. Multi-sentence queries are fine.
vendorstringRestrict results to a single vendor/stack (e.g. "asterisk", "kamailio"). Omit to search all vendors.one of
asterisk · freeswitch · kamailio · opensips · freepbx · yatesourceTypevalueRestrict by document type. Available: rfc | pbx (Asterisk/FreeSWITCH/Kamailio/OpenSIPS) | sbc (SBCs) | cpaas (Twilio/Telnyx/...) | uc-cloud (Teams/Zoom/...) | endpoint (phones/softphones) | stir-shaken | transport (RTP/SRTP/DTLS/ICE/STUN/TURN RFCs) | regulatory | observability.
lookup_response_code[cost: free (pure CPU, no network) | read-only] Instant static lookup of a SIP response code (100-699). Returns name, RFC anchor, category, description, common operator-flavored causes, and known vendor-specific reason-phrase variants (e.g. OpenSIPS emits 484 'Invalid FROM' on...1 params
[cost: free (pure CPU, no network) | read-only] Instant static lookup of a SIP response code (100-699). Returns name, RFC anchor, category, description, common operator-flavored causes, and known vendor-specific reason-phrase variants (e.g. OpenSIPS emits 484 'Invalid FROM' on...
Parameters* required
codeintegerSIP response code (e.g. 488 for Not Acceptable Here).
lookup_sip_header[cost: free (pure CPU, no network) | read-only] Instant lookup of a SIP header by canonical or compact form (e.g. "Via" / "v", "Diversion", "P-Asserted-Identity", "Identity", "Session-Expires"). Returns canonical form, compact alias, RFC anchor, where it appears (request / res...1 params
[cost: free (pure CPU, no network) | read-only] Instant lookup of a SIP header by canonical or compact form (e.g. "Via" / "v", "Diversion", "P-Asserted-Identity", "Identity", "Session-Expires"). Returns canonical form, compact alias, RFC anchor, where it appears (request / res...
Parameters* required
namestringHeader name (canonical, e.g. "Via", or compact, e.g. "v"). Case-insensitive.
detect_sip_stack[cost: free (pure CPU, no network) | read-only] Identify the SIP product behind a piece of input. Works on both: - a SIP trace (User-Agent / Server headers from PCAP/sngrep/syslog), and - a vendor config blob (kamailio.cfg, sip.conf, pjsip.conf, FreeSWITCH XML, opensips.cfg) d...3 params
[cost: free (pure CPU, no network) | read-only] Identify the SIP product behind a piece of input. Works on both: - a SIP trace (User-Agent / Server headers from PCAP/sngrep/syslog), and - a vendor config blob (kamailio.cfg, sip.conf, pjsip.conf, FreeSWITCH XML, opensips.cfg) d...
Parameters* required
kindstringWhat the input is. "trace" looks at SIP headers only, "config" runs vendor-config heuristics, "auto" tries trace first then falls back to config detection.one of
auto · trace · configdefault: autotextstringRaw SIP trace text OR a vendor config blob.
filenameHintstringOptional filename (e.g. "kamailio.cfg", "pjsip.conf"). Strongly improves config-mode detection when supplied.
detect_sip_vendor_from_config[cost: free (pure CPU, no network) | read-only] Heuristic-only sibling of `detect_sip_stack`, scoped to vendor configs. Returns the matched vendor slug, a confidence level, and the structural signals that fired (loadmodule syntax, route blocks, profile elements, etc.). Use thi...2 params
[cost: free (pure CPU, no network) | read-only] Heuristic-only sibling of `detect_sip_stack`, scoped to vendor configs. Returns the matched vendor slug, a confidence level, and the structural signals that fired (loadmodule syntax, route blocks, profile elements, etc.). Use thi...
Parameters* required
textstringConfig blob (UTF-8 plaintext).
filenameHintstringOptional filename ("kamailio.cfg", "pjsip.conf", "sofia/external.xml") to bias detection.
minimize_sip_trace[cost: free (pure CPU, no network) | read-only, no persistence] Reduce a raw SIP trace to a compact form suitable for sending to an LLM. Preserves SDP bodies and routing/auth/dialog headers; prunes well-known noise (User-Agent, Server, Allow, Accept-*, Date, P-* informational,...2 params
[cost: free (pure CPU, no network) | read-only, no persistence] Reduce a raw SIP trace to a compact form suitable for sending to an LLM. Preserves SDP bodies and routing/auth/dialog headers; prunes well-known noise (User-Agent, Server, Allow, Accept-*, Date, P-* informational,...
Parameters* required
textstringRaw SIP trace text. Multiple messages may be concatenated.
maxBytesintegerTruncate the minimized output if it exceeds this many bytes (default 200000, matches Sipflow's analyze pipeline).default: 200000
render_sip_ladder[cost: free (pure CPU, no network) | read-only] Parse a raw SIP trace (PCAP-decoded text, sngrep export, syslog, or pasted INVITE/200 dialog) and emit a Mermaid `sequenceDiagram` block visualizing the call flow. Most chat hosts (Claude, ChatGPT, Cursor, GitHub) render Mermaid...10 params
[cost: free (pure CPU, no network) | read-only] Parse a raw SIP trace (PCAP-decoded text, sngrep export, syslog, or pasted INVITE/200 dialog) and emit a Mermaid `sequenceDiagram` block visualizing the call flow. Most chat hosts (Claude, ChatGPT, Cursor, GitHub) render Mermaid...
Parameters* required
textstringRaw SIP trace text. Multiple messages may be concatenated.
callIdstringRender only this Call-ID. Required when the trace contains multiple calls; otherwise the only call is used.
aliasesobjectFriendly lane labels. Match order: exact "ip:port" → bare "ip" → top-Via host (with or without port) → Contact host (with or without port). Most-specific match wins; otherwise the lane is labeled with its raw "ip:port" (never "unknown"). Example: `{"192.0.2.10:5060":"Alice","203.0.113.50":"Carrier"}`.
compactbooleanDrop OPTIONS keepalives and retransmissions. Hidden counts are summarized in a `Note over` line.default: false
maxMessagesintegerHard cap on rendered arrows. Extra messages produce a truncation note. Hard ceiling is 200.default: 60
includeTimingbooleanAppend `+Nms` (delta from previous arrow) to each arrow label.default: false
groupRetransmitsbooleanCollapse adjacent identical retransmissions on the same direction into a single arrow + `Note over: xN over Tms`. Independent of `compact` (which drops them entirely).default: true
splitOnNewBranchbooleanEmit a `--- failover to <ip:port> ---` separator before any request sent to a previously-unseen destination. Useful when the trace fails over between gateway IPs.default: false
highlightFailuresbooleanBold the first non-1xx final response per request leg (CSeq) so the failure jumps out in the ladder.default: true
correlationHeadersarrayHeader names to use for cross-leg call correlation (value-equality). When provided, calls sharing the same value for any listed header are merged into one ladder. Example: `["X-ACME-Session-ID","X-ACME-Call-ID"]`.
sip_ladder_example[cost: free (pure CPU, no network) | read-only] Return a hand-curated SIP scenario as a Mermaid `sequenceDiagram` plus a bullet list of step-by-step explanations with RFC references. Use this when the user asks 'show me what X looks like' and you don't have a real trace handy....4 params
[cost: free (pure CPU, no network) | read-only] Return a hand-curated SIP scenario as a Mermaid `sequenceDiagram` plus a bullet list of step-by-step explanations with RFC references. Use this when the user asks 'show me what X looks like' and you don't have a real trace handy....
Parameters* required
verbosebooleanAlso include the scenario's long Markdown explanation. Useful when the LLM is going to teach the user; off by default to keep responses small.default: false
scenariostringWhich scenario to render. Valid ids: basic-call, auth-challenge, cancel-before-answer, early-media, hold-resume, refer-blind, proxy-with-record-route, shaken-attested-invite, bye-glare, redirect-302.one of
basic-call · auth-challenge · cancel-before-answer · early-media · hold-resume · refer-blindactorNamesobjectOverride the default actor display names (Alice/Bob/Proxy). Maps to the first/second/third lane in left-to-right order.
includeExplanationbooleanAppend a bulleted **Notes** section with RFC references for each step.default: true
lint_sip_request[cost: free (pure CPU, no network) | read-only, no persistence] Run RFC 3261 / RFC 3325 / RFC 8224 / RFC 8225 / CTIA BCID compliance checks on a single raw SIP request (typically an INVITE) and return a list of findings. Catches the failure modes that silently break carrier in...1 params
[cost: free (pure CPU, no network) | read-only, no persistence] Run RFC 3261 / RFC 3325 / RFC 8224 / RFC 8225 / CTIA BCID compliance checks on a single raw SIP request (typically an INVITE) and return a list of findings. Catches the failure modes that silently break carrier in...
Parameters* required
textstringRaw SIP request text. Should start with the request line (e.g. `INVITE sip:...@... SIP/2.0`). Headers must be CRLF or LF separated.
parse_sip_message[cost: free (pure CPU, no network) | read-only, no persistence] Parse a single raw SIP message (request OR response) and return a structured view: start line (method/status), every header in order with line numbers, body, duplicate-header counts, and a list of structural flags...1 params
[cost: free (pure CPU, no network) | read-only, no persistence] Parse a single raw SIP message (request OR response) and return a structured view: start line (method/status), every header in order with line numbers, body, duplicate-header counts, and a list of structural flags...
Parameters* required
textstringRaw SIP message text. Should start with a request line (`INVITE sip:...@... SIP/2.0`) or status line (`SIP/2.0 200 OK`). Headers must be CRLF or LF separated.
diff_sip_messages[cost: free (pure CPU, no network) | read-only, no persistence] Take two SIP messages (typically the same request observed at two adjacent hops - e.g. the INVITE leaving FreeSWITCH and the INVITE arriving at Kamailio) and surface a structured per-header diff: `added`, `removed...4 params
[cost: free (pure CPU, no network) | read-only, no persistence] Take two SIP messages (typically the same request observed at two adjacent hops - e.g. the INVITE leaving FreeSWITCH and the INVITE arriving at Kamailio) and surface a structured per-header diff: `added`, `removed...
Parameters* required
afterstringSIP message as observed at the *downstream* hop (e.g. what Kamailio believes it received).
beforestringSIP message as observed at the *upstream* hop (e.g. what FreeSWITCH believes it sent).
labelAfterstringDisplay label for the downstream side. Default "after".default: after
labelBeforestringDisplay label for the upstream side. Default "before".default: before
review_sip_config[cost: free (pure CPU, no network) | read-only] Use this when the user asks 'review my config' or attaches a kamailio.cfg, sip.conf, pjsip.conf, FreeSWITCH XML profile, opensips.cfg, or a SIP-shaped source file from a repo. This tool: 1. Detects the vendor from filename + stru...3 params
[cost: free (pure CPU, no network) | read-only] Use this when the user asks 'review my config' or attaches a kamailio.cfg, sip.conf, pjsip.conf, FreeSWITCH XML profile, opensips.cfg, or a SIP-shaped source file from a repo. This tool: 1. Detects the vendor from filename + stru...
Parameters* required
textstringThe full config blob (or a representative excerpt). UTF-8 plaintext.
vendorHintstringSkip auto-detection and force a specific vendor. Use when the heuristics return low confidence or the wrong vendor.one of
asterisk · freeswitch · kamailio · opensips · freepbx · yatefilenameHintstringOptional filename or path (e.g. "kamailio.cfg", "etc/asterisk/pjsip.conf", "sofia/external.xml"). Strongly improves vendor detection.
webrtc_sip_checklist[cost: free (pure CPU, no network) | read-only] Return a curated checklist of WebRTC ↔ SIP requirements (WSS transport, ICE gathering, DTLS-SRTP fingerprint, rtcp-mux + BUNDLE, media relay / rtpengine, STUN/TURN, secure-context Origin allowlist, Opus codec, session-timer behav...3 params
[cost: free (pure CPU, no network) | read-only] Return a curated checklist of WebRTC ↔ SIP requirements (WSS transport, ICE gathering, DTLS-SRTP fingerprint, rtcp-mux + BUNDLE, media relay / rtpengine, STUN/TURN, secure-context Origin allowlist, Opus codec, session-timer behav...
Parameters* required
vendorstringVendor slug. Omit and supply `configText` to auto-detect.one of
asterisk · freeswitch · kamailio · opensips · freepbx · yateconfigTextstringOptional config blob. When supplied, items with matching signals are marked as present; vendor is auto-detected if not supplied.
filenameHintstringOptional filename ("kamailio.cfg", etc.) to bias auto-detection.
parse_sdp[cost: free (pure CPU, no network) | read-only] Parse a Session Description Protocol body and return a structured view: origin, session, timing, per-media codecs (rtpmap + fmtp), direction, DTLS setup + fingerprint, ICE credentials + candidates, rtcp-mux, BUNDLE groups, and cr...1 params
[cost: free (pure CPU, no network) | read-only] Parse a Session Description Protocol body and return a structured view: origin, session, timing, per-media codecs (rtpmap + fmtp), direction, DTLS setup + fingerprint, ICE credentials + candidates, rtcp-mux, BUNDLE groups, and cr...
Parameters* required
sdpstringSDP body - the section after the empty line in an INVITE/200/UPDATE.
compare_sdp_offer_answer[cost: free (pure CPU, no network) | read-only] Diff a SIP/SDP offer and answer and surface the issues that actually break calls in practice: codec intersection per m-line, direction compatibility (sendrecv ↔ recvonly), DTLS setup-role conflicts (active+active / passive+passiv...2 params
[cost: free (pure CPU, no network) | read-only] Diff a SIP/SDP offer and answer and surface the issues that actually break calls in practice: codec intersection per m-line, direction compatibility (sendrecv ↔ recvonly), DTLS setup-role conflicts (active+active / passive+passiv...
Parameters* required
offerstringSDP offer body.
answerstringSDP answer body.
validate_stir_shaken_identity[cost: external_io (HTTPS fetch of the x5u cert) | read-only] Verify a SIP `Identity:` JWS (RFC 8224 / SHAKEN). Fetches the x5u certificate, parses it, verifies the ES256 signature against the cert's public key, and optionally validates the RCD icon hash (RFC 9795). The icon-h...8 params
[cost: external_io (HTTPS fetch of the x5u cert) | read-only] Verify a SIP `Identity:` JWS (RFC 8224 / SHAKEN). Fetches the x5u certificate, parses it, verifies the ES256 signature against the cert's public key, and optionally validates the RCD icon hash (RFC 9795). The icon-h...
Parameters* required
rcdiobjectFull `payload.rcdi` claim. The validator looks up `/icn` first (RFC 9795 §6.1 spec form), then falls back to the legacy `icn` key (still seen in the wild). A legacy hit produces a `rcdi-pointer-form` warning unless `strictRfc9795: true` (then it fails).
iconUrlstringRCD icon URL - `payload.rcd.icn`. Omit if no Rich Call Data icon.
infoUrlstringCert URL from the SIP Identity header `info=` param (or the JWT `x5u`). If omitted, signature verification is skipped.
headerB64stringBase64url-encoded JWS protected header (the first dot-separated segment).
payloadB64stringBase64url-encoded JWS payload (the second segment).
signatureB64stringBase64url-encoded ES256 signature (the third segment, raw R||S, 64 bytes).
strictRfc9795booleanWhen true, reject the legacy `rcdi['icn']` key as a hard failure rather than warning. Default false.
expectedIconHashstringPre-extracted icon hash, e.g. `sha256-XYZ` (RFC 9795 §6.1 form `<algorithm>-<base64>`). Pass this OR `rcdi`.
stir_attestation_explainer[cost: free (pure CPU, no network) | read-only] Static explainer for STIR/SHAKEN: maps attestation levels (A / B / C per RFC 8588) to plain-English requirements + common scenarios, and SIP codes commonly emitted by signing/verification (428 / 436 / 437 / 438 / 608) to their RF...2 params
[cost: free (pure CPU, no network) | read-only] Static explainer for STIR/SHAKEN: maps attestation levels (A / B / C per RFC 8588) to plain-English requirements + common scenarios, and SIP codes commonly emitted by signing/verification (428 / 436 / 437 / 438 / 608) to their RF...
Parameters* required
codeintegerSIP response code commonly seen in STIR/SHAKEN flows (428, 436, 437, 438, 608).
attestationstringAttestation level: "A" Full / "B" Partial / "C" Gateway.one of
A · B · Cvalidate_e164_number[cost: free (pure CPU, no network) | read-only] Parse a phone number, normalize to E.164, and classify it. International coverage is via libphonenumber-js (every country, line type when known). NANP numbers (CC=1) are additionally split into NPA (area code) / NXX (central offi...1 params
[cost: free (pure CPU, no network) | read-only] Parse a phone number, normalize to E.164, and classify it. International coverage is via libphonenumber-js (every country, line type when known). NANP numbers (CC=1) are additionally split into NPA (area code) / NXX (central offi...
Parameters* required
numberstringPhone number in any common form. E.164 (+CCNNN…) is preferred; 10-digit US numbers are accepted as a convenience.
troubleshoot_response_code[cost: rag (one embed + one vector search) | read-only, network: outbound to embed model only | rate-limited per IP] Like `lookup_response_code` but augmented: returns the static RFC entry PLUS the top vendor-specific RAG hits for the exact code (and any free-text context the...3 params
[cost: rag (one embed + one vector search) | read-only, network: outbound to embed model only | rate-limited per IP] Like `lookup_response_code` but augmented: returns the static RFC entry PLUS the top vendor-specific RAG hits for the exact code (and any free-text context the...
Parameters* required
codeintegerSIP response code (e.g. 488, 503, 438).
contextstringOptional free-text context: a snippet of the trace, the Reason header, the Warning header, or a one-line description of what the user was trying to do.
vendorHintstringVendor slug to filter the RAG search (e.g. "kamailio", "freeswitch", "twilio"). Strongly recommended.one of
asterisk · freeswitch · kamailio · opensips · freepbx · yatedns_diagnose_sip_target[cost: external_io (DNS via Cloudflare + Google; TLS handshake to public sips/_sips._tcp targets when applicable) | read-only | rate-limited per IP: 10/min, 200/day] Walk DNS the same way a SIP UA does (RFC 3263 §4.1): NAPTR → SRV → A/AAAA. Given a SIP URI ("sip:example.com"),...2 params
[cost: external_io (DNS via Cloudflare + Google; TLS handshake to public sips/_sips._tcp targets when applicable) | read-only | rate-limited per IP: 10/min, 200/day] Walk DNS the same way a SIP UA does (RFC 3263 §4.1): NAPTR → SRV → A/AAAA. Given a SIP URI ("sip:example.com"),...
Parameters* required
targetstringSIP URI ("sip:example.com"), "example.com:5060", or bare hostname ("example.com"). Userinfo is stripped before lookup.
transportstringTransport hint. "any" surfaces all NAPTR services; specific transports filter the SRV walk to that service.one of
any · udp · tcp · tls · ws · wssdefault: anyfetch_sipflow_share[cost: external_io (Mongo + S3 fetch on the Sipflow backend) | read-only, no persistence | rate limit: shared with the public share endpoint] Given a Sipflow share URL (https://sipflow.dev/share/<token>, or any sipflow.dev subdomain that serves /share/<token>), load the shared...1 params
[cost: external_io (Mongo + S3 fetch on the Sipflow backend) | read-only, no persistence | rate limit: shared with the public share endpoint] Given a Sipflow share URL (https://sipflow.dev/share/<token>, or any sipflow.dev subdomain that serves /share/<token>), load the shared...
Parameters* required
urlstringFull Sipflow share URL. Example: "https://sipflow.dev/share/eyJqb2JJZCI6Ii4uLiJ9.abc123". The path must be /share/<token>; /api/share/... endpoints are not accepted.
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)
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:
sipflowserver in Settings -> Features -> Model Context Protocolsip-debuggerskill under Settings -> Rules (Agent Decides)sip-groundingrule 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.
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