{
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  "docId": "RFC5039",
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    "abstract": "Spam, defined as the transmission of bulk unsolicited messages, has plagued Internet email. Unfortunately, spam is not limited to email. It can affect any system that enables user-to-user communications. The Session Initiation Protocol (SIP) defines a system for user-to- user multimedia communications. Therefore, it is susceptible to spam, just as email is. In this document, we analyze the problem of spam in SIP. We first identify the ways in which the problem is the same and the ways in which it is different from email. We then examine the various possible solutions that have been discussed for email and consider their applicability to SIP. This memo provides information for the Internet community.",
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    "authors": [
      {
        "name": "Jonathan Rosenberg"
      },
      {
        "name": "Cullen Fluffy Jennings"
      }
    ],
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      "confidence": "high",
      "note": "Parsed from Datatracker doc page article:author (profile full names)",
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      "updated": "2026-10-16T15:47:41.944Z",
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    "docId": "RFC5039",
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      "confidence": "high",
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      "originalValue": null,
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      "sourceUrl": "https://www.rfc-editor.org/info/rfc5039/",
      "updated": "2026-10-16T15:47:41.944Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
    "docLabel": "IETF RFC 5039",
    "docLabel$meta": {
      "confidence": "high",
      "note": "Constructed from provider and document identifier",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc5039/",
      "updated": "2026-10-16T15:47:41.944Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
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    "docNumber": "5039",
    "docNumber$meta": {
      "confidence": "high",
      "note": "Parsed from RFC info page report metadata",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc5039/",
      "updated": "2026-10-16T15:47:41.944Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
    "docTitle": "The Session Initiation Protocol (SIP) and Spam",
    "docTitle$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML title",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc5039/",
      "updated": "2026-10-16T15:47:41.944Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
    "docType": "Informational",
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      "confidence": "high",
      "note": "Mapped from Datatracker std_level or RFC status text",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc5039/",
      "updated": "2026-10-16T15:47:41.944Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
    "doi": "10.17487/RFC5039",
    "doi$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML doi",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc5039/",
      "updated": "2026-10-16T15:47:41.944Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
    "href": "https://doi.org/10.17487/RFC5039",
    "href$meta": {
      "confidence": "high",
      "note": "Derived from DOI (https://doi.org/<doi>)",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc5039/",
      "updated": "2026-10-16T15:47:41.944Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
    "pages": "28",
    "pages$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML page-count",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc5039/",
      "updated": "2026-10-16T15:47:41.944Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
    "publicationDate": "2008-01-01",
    "publicationDate$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML date",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc5039/",
      "updated": "2026-10-16T15:47:41.944Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
    "publisher": "IETF",
    "publisher$meta": {
      "confidence": "high",
      "note": "Static: provider",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc5039/",
      "updated": "2026-10-16T15:47:41.944Z",
      "version": "extractDocs.js@commit:e0fe4a71cd26"
    },
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      "bibliographic": [
        "RFC4975",
        "RFC3261",
        "RFC3428",
        "RFC3265",
        "RFC3325",
        "RFC3856",
        "RFC3857",
        "RFC3858",
        "RFC3761",
        "RFC4825",
        "RFC5025",
        "RFC4730",
        "RFC4474",
        "RFC4405",
        "RFC4406",
        "RFC4407",
        "RFC4408",
        "RFC4346",
        "RFC4871",
        "RFC3851",
        "RFC3156",
        "orphan/RFC5039/h:715ab616",
        "orphan/RFC5039/h:c5c6651d",
        "orphan/RFC5039/h:c236b063",
        "orphan/RFC5039/h:0700dbf7",
        "orphan/RFC5039/h:6dfd33e9",
        "orphan/RFC5039/h:45c6ec4b",
        "orphan/RFC5039/h:c81a1883"
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        "confidence": "medium",
        "flag": "MIXED_REF_LAYOUT_RISK anchored=28 proseBlocks=32 skippedAnchorBlocks=30",
        "note": "Parsed from RFC HTML references/informative sections",
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        "source": "parsed",
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        "version": "extractDocs.js@commit:e0fe4a71cd26"
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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/rfc5039/",
      "updated": "2026-10-16T15:47:41.944Z",
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        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc5039/",
        "updated": "2026-10-16T15:47:41.944Z",
        "version": "extractDocs.js@commit:e0fe4a71cd26"
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        "confidence": "high",
        "note": "Derived from presence of errata links on RFC/Datatracker pages",
        "originalValue": null,
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc5039/",
        "updated": "2026-10-16T15:47:41.945Z",
        "version": "extractDocs.js@commit:e0fe4a71cd26"
      },
      "latestVersion": true,
      "latestVersion$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc5039/",
        "updated": "2026-10-16T15:47:41.944Z",
        "version": "extractDocs.js@commit:e0fe4a71cd26"
      },
      "statusNote": "Informational",
      "statusNote$meta": {
        "confidence": "high",
        "note": "Mapped from Datatracker doc.json std_level",
        "originalValue": null,
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc5039/",
        "updated": "2026-10-16T15:47:41.945Z",
        "version": "extractDocs.js@commit:e0fe4a71cd26"
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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/rfc5039/",
        "updated": "2026-10-16T15:47:41.945Z",
        "version": "extractDocs.js@commit:e0fe4a71cd26"
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}