{
  "$schema": "/api/schemas/documents.schema.json",
  "apiVersion": "1.1.0",
  "lastModified": "2026-10-13T17:51:50.559Z",
  "sourcePath": "src/main/data/docs",
  "docId": "RFC3840",
  "document": {
    "abstract": "This specification defines mechanisms by which a Session Initiation Protocol (SIP) user agent can convey its capabilities and characteristics to other user agents and to the registrar for its domain. This information is conveyed as parameters of the Contact header field. [STANDARDS-TRACK]",
    "abstract$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML abstract",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc3840/",
      "updated": "2026-10-13T17:21:42.885Z",
      "version": "extractDocs.js@commit:996495349225"
    },
    "authors": [
      {
        "name": "Jonathan Rosenberg"
      },
      {
        "name": "Henning Schulzrinne"
      },
      {
        "name": "Paul Kyzivat"
      }
    ],
    "authors$meta": {
      "confidence": "high",
      "note": "Parsed from Datatracker doc page article:author (profile full names)",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc3840/",
      "updated": "2026-10-13T17:21:42.885Z",
      "version": "extractDocs.js@commit:996495349225"
    },
    "docId": "RFC3840",
    "docId$meta": {
      "confidence": "high",
      "note": "Derived from RFC number or Datatracker identifier",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc3840/",
      "updated": "2026-10-13T17:21:42.885Z",
      "version": "extractDocs.js@commit:996495349225"
    },
    "docLabel": "IETF RFC 3840",
    "docLabel$meta": {
      "confidence": "high",
      "note": "Constructed from provider and document identifier",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc3840/",
      "updated": "2026-10-13T17:21:42.885Z",
      "version": "extractDocs.js@commit:996495349225"
    },
    "docNumber": "3840",
    "docNumber$meta": {
      "confidence": "high",
      "note": "Parsed from RFC info page report metadata",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc3840/",
      "updated": "2026-10-13T17:21:42.885Z",
      "version": "extractDocs.js@commit:996495349225"
    },
    "docTitle": "Indicating User Agent Capabilities in the Session Initiation Protocol (SIP)",
    "docTitle$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML title",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc3840/",
      "updated": "2026-10-13T17:21:42.885Z",
      "version": "extractDocs.js@commit:996495349225"
    },
    "docType": "Standard",
    "docType$meta": {
      "confidence": "high",
      "note": "Mapped from Datatracker std_level or RFC status text",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc3840/",
      "updated": "2026-10-13T17:21:42.885Z",
      "version": "extractDocs.js@commit:996495349225"
    },
    "doi": "10.17487/RFC3840",
    "doi$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML doi",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc3840/",
      "updated": "2026-10-13T17:21:42.885Z",
      "version": "extractDocs.js@commit:996495349225"
    },
    "href": "https://doi.org/10.17487/RFC3840",
    "href$meta": {
      "confidence": "high",
      "note": "Derived from DOI (https://doi.org/<doi>)",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc3840/",
      "updated": "2026-10-13T17:21:42.885Z",
      "version": "extractDocs.js@commit:996495349225"
    },
    "keywords": [
      "User Agent",
      "SIP"
    ],
    "keywords$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML keywords",
      "originalValue": [
        "User Agent",
        "Contact Header Field",
        "SIP"
      ],
      "overridden": true,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc3840/",
      "updated": "2026-10-13T17:51:50.559Z",
      "version": "extractDocs.js@commit:25936397c06b"
    },
    "pages": "36",
    "pages$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML page-count",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc3840/",
      "updated": "2026-10-13T17:21:42.885Z",
      "version": "extractDocs.js@commit:996495349225"
    },
    "publicationDate": "2004-08-01",
    "publicationDate$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML date",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc3840/",
      "updated": "2026-10-13T17:21:42.885Z",
      "version": "extractDocs.js@commit:996495349225"
    },
    "publisher": "IETF",
    "publisher$meta": {
      "confidence": "high",
      "note": "Static: provider",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc3840/",
      "updated": "2026-10-13T17:21:42.885Z",
      "version": "extractDocs.js@commit:996495349225"
    },
    "references": {
      "bibliographic": [
        "RFC3841",
        "RFC3842",
        "RFC3428",
        "RFC2703",
        "RFC2434",
        "orphan/RFC3840/h:843c5f38",
        "orphan/RFC3840/h:0c7aaaa4",
        "orphan/RFC3840/h:cb517691"
      ],
      "bibliographic$meta": {
        "confidence": "medium",
        "flag": "MIXED_REF_LAYOUT_RISK anchored=18 proseBlocks=23 skippedAnchorBlocks=20",
        "note": "Parsed from RFC HTML references/informative sections",
        "originalValue": [],
        "reviewRequired": true,
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc3840/",
        "updated": "2026-10-13T17:21:42.885Z",
        "version": "extractDocs.js@commit:996495349225"
      },
      "normative": [
        "RFC3261",
        "RFC2119",
        "RFC2506",
        "RFC2533",
        "RFC2738",
        "RFC2987",
        "RFC2913",
        "RFC2327",
        "RFC3265",
        "RFC2396"
      ],
      "normative$meta": {
        "confidence": "high",
        "note": "Parsed from RFC HTML normative references sections",
        "originalValue": [],
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc3840/",
        "updated": "2026-10-13T17:21:42.885Z",
        "version": "extractDocs.js@commit:996495349225"
      }
    },
    "resolvedHref": "https://www.rfc-editor.org/info/rfc3840/",
    "resolvedHref$meta": {
      "confidence": "high",
      "note": "Final URL resolved via URL redirect verification",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc3840/",
      "updated": "2026-10-13T17:21:42.885Z",
      "version": "extractDocs.js@commit:996495349225"
    },
    "status": {
      "active": true,
      "active$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc3840/",
        "updated": "2026-10-13T17:21:42.885Z",
        "version": "extractDocs.js@commit:996495349225"
      },
      "errataExist": false,
      "errataExist$meta": {
        "confidence": "high",
        "note": "Derived from presence of errata links on RFC/Datatracker pages",
        "originalValue": null,
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc3840/",
        "updated": "2026-10-13T17:21:42.885Z",
        "version": "extractDocs.js@commit:996495349225"
      },
      "latestVersion": true,
      "latestVersion$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc3840/",
        "updated": "2026-10-13T17:21:42.885Z",
        "version": "extractDocs.js@commit:996495349225"
      },
      "statusNote": "Proposed Standard",
      "statusNote$meta": {
        "confidence": "high",
        "note": "Mapped from Datatracker doc.json std_level",
        "originalValue": null,
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc3840/",
        "updated": "2026-10-13T17:21:42.885Z",
        "version": "extractDocs.js@commit:996495349225"
      },
      "superseded": false,
      "superseded$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc3840/",
        "updated": "2026-10-13T17:21:42.885Z",
        "version": "extractDocs.js@commit:996495349225"
      }
    }
  }
}