{
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  "sourcePath": "src/main/data/docs",
  "docId": "RFC4579",
  "document": {
    "abstract": "This specification defines conferencing call control features for the Session Initiation Protocol (SIP). This document builds on the Conferencing Requirements and Framework documents to define how a tightly coupled SIP conference works. The approach is explored from the perspective of different user agent (UA) types: conference-unaware, conference-aware, and focus UAs. The use of Uniform Resource Identifiers (URIs) in conferencing, OPTIONS for capabilities discovery, and call control using REFER are covered in detail with example call flow diagrams. The usage of the isfocus feature tag is defined. This document specifies an Internet Best Current Practices for the Internet Community, and requests discussion and suggestions for improvements.",
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      "updated": "2026-10-13T18:21:42.788Z",
      "version": "extractDocs.js@commit:6d30695438dd"
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    "authors": [
      {
        "name": "Alan Johnston"
      },
      {
        "name": "Orit Levin"
      }
    ],
    "authors$meta": {
      "confidence": "high",
      "note": "Parsed from Datatracker doc page article:author (profile full names)",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4579/",
      "updated": "2026-10-13T18:21:42.788Z",
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    "docId": "RFC4579",
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      "confidence": "high",
      "note": "Derived from RFC number or Datatracker identifier",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4579/",
      "updated": "2026-10-13T18:21:42.788Z",
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    },
    "docLabel": "IETF RFC 4579",
    "docLabel$meta": {
      "confidence": "high",
      "note": "Constructed from provider and document identifier",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4579/",
      "updated": "2026-10-13T18:21:42.788Z",
      "version": "extractDocs.js@commit:6d30695438dd"
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    "docNumber": "4579",
    "docNumber$meta": {
      "confidence": "high",
      "note": "Parsed from RFC info page report metadata",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4579/",
      "updated": "2026-10-13T18:21:42.788Z",
      "version": "extractDocs.js@commit:6d30695438dd"
    },
    "docTitle": "Session Initiation Protocol (SIP) Call Control - Conferencing for User Agents",
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      "confidence": "high",
      "note": "Parsed from RFC index XML title",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4579/",
      "updated": "2026-10-13T18:21:42.788Z",
      "version": "extractDocs.js@commit:6d30695438dd"
    },
    "docType": "Best Practice",
    "docType$meta": {
      "confidence": "high",
      "note": "Mapped from Datatracker std_level or RFC status text",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4579/",
      "updated": "2026-10-13T18:21:42.788Z",
      "version": "extractDocs.js@commit:6d30695438dd"
    },
    "doi": "10.17487/RFC4579",
    "doi$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML doi",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4579/",
      "updated": "2026-10-13T18:21:42.788Z",
      "version": "extractDocs.js@commit:6d30695438dd"
    },
    "href": "https://doi.org/10.17487/RFC4579",
    "href$meta": {
      "confidence": "high",
      "note": "Derived from DOI (https://doi.org/<doi>)",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4579/",
      "updated": "2026-10-13T18:21:42.788Z",
      "version": "extractDocs.js@commit:6d30695438dd"
    },
    "keywords": [
      "User Agent"
    ],
    "keywords$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML keywords",
      "originalValue": [
        "User Agent",
        "Conference-unaware",
        "Conference-aware",
        "Focus"
      ],
      "overridden": true,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4579/",
      "updated": "2026-10-13T18:59:29.874Z",
      "version": "extractDocs.js@commit:8ad844f404e0"
    },
    "pages": "43",
    "pages$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML page-count",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4579/",
      "updated": "2026-10-13T18:21:42.788Z",
      "version": "extractDocs.js@commit:6d30695438dd"
    },
    "publicationDate": "2006-08-01",
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      "confidence": "high",
      "note": "Parsed from RFC index XML date",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4579/",
      "updated": "2026-10-13T18:21:42.788Z",
      "version": "extractDocs.js@commit:6d30695438dd"
    },
    "publisher": "IETF",
    "publisher$meta": {
      "confidence": "high",
      "note": "Static: provider",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4579/",
      "updated": "2026-10-13T18:21:42.788Z",
      "version": "extractDocs.js@commit:6d30695438dd"
    },
    "references": {
      "bibliographic": [
        "RFC3087",
        "RFC3420",
        "RFC3665",
        "RFC4245",
        "RFC4235",
        "orphan/RFC4579/h:4e21ead7",
        "orphan/RFC4579/h:5b27816e",
        "orphan/RFC4579/h:1d4f6457"
      ],
      "bibliographic$meta": {
        "confidence": "medium",
        "flag": "MIXED_REF_LAYOUT_RISK anchored=18 proseBlocks=23 skippedAnchorBlocks=20",
        "note": "Parsed from RFC HTML references/informative sections",
        "originalValue": [],
        "reviewRequired": true,
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4579/",
        "updated": "2026-10-13T18:21:42.788Z",
        "version": "extractDocs.js@commit:6d30695438dd"
      },
      "normative": [
        "RFC2119",
        "RFC3261",
        "RFC3265",
        "RFC3515",
        "RFC3840",
        "RFC3891",
        "RFC3911",
        "RFC4353",
        "RFC4575",
        "RFC3323"
      ],
      "normative$meta": {
        "confidence": "high",
        "note": "Parsed from RFC HTML normative references sections",
        "originalValue": [],
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4579/",
        "updated": "2026-10-13T18:21:42.788Z",
        "version": "extractDocs.js@commit:6d30695438dd"
      }
    },
    "resolvedHref": "https://www.rfc-editor.org/info/rfc4579/",
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      "confidence": "high",
      "note": "Final URL resolved via URL redirect verification",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc4579/",
      "updated": "2026-10-13T18:21:42.788Z",
      "version": "extractDocs.js@commit:6d30695438dd"
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    "status": {
      "active": true,
      "active$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4579/",
        "updated": "2026-10-13T18:21:42.788Z",
        "version": "extractDocs.js@commit:6d30695438dd"
      },
      "errataExist": false,
      "errataExist$meta": {
        "confidence": "high",
        "note": "Derived from presence of errata links on RFC/Datatracker pages",
        "originalValue": null,
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4579/",
        "updated": "2026-10-13T18:21:42.788Z",
        "version": "extractDocs.js@commit:6d30695438dd"
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      "latestVersion": true,
      "latestVersion$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4579/",
        "updated": "2026-10-13T18:21:42.788Z",
        "version": "extractDocs.js@commit:6d30695438dd"
      },
      "statusNote": "Best Current Practice",
      "statusNote$meta": {
        "confidence": "high",
        "note": "Mapped from Datatracker doc.json std_level",
        "originalValue": null,
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4579/",
        "updated": "2026-10-13T18:21:42.788Z",
        "version": "extractDocs.js@commit:6d30695438dd"
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      "superseded": false,
      "superseded$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc4579/",
        "updated": "2026-10-13T18:21:42.788Z",
        "version": "extractDocs.js@commit:6d30695438dd"
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}