{
  "$schema": "/api/schemas/documents.schema.json",
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  "lastModified": "2026-10-20T21:46:40.114Z",
  "sourcePath": "src/main/data/docs",
  "docId": "RFC8853",
  "document": {
    "abstract": "In some application scenarios, it may be desirable to send multiple differently encoded versions of the same media source in different RTP streams. This is called simulcast. This document describes how to accomplish simulcast in RTP and how to signal it in the Session Description Protocol (SDP). The described solution uses an RTP/RTCP identification method to identify RTP streams belonging to the same media source and makes an extension to SDP to indicate that those RTP streams are different simulcast formats of that media source. The SDP extension consists of a new media-level SDP attribute that expresses capability to send and/or receive simulcast RTP streams.",
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      "confidence": "high",
      "note": "Parsed from RFC index XML abstract",
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      "updated": "2026-10-20T21:46:40.114Z",
      "version": "extractDocs.js@commit:92f3ced618ff"
    },
    "authors": [
      {
        "name": "Bo Burman"
      },
      {
        "name": "Magnus Westerlund"
      },
      {
        "name": "Suhas Nandakumar"
      },
      {
        "name": "Mo Zanaty"
      }
    ],
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      "confidence": "high",
      "note": "Parsed from Datatracker doc page article:author (profile full names)",
      "originalValue": null,
      "source": "parsed",
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      "updated": "2026-10-20T21:46:40.114Z",
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    },
    "docId": "RFC8853",
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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/rfc8853/",
      "updated": "2026-10-20T21:46:40.113Z",
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    },
    "docLabel": "IETF RFC 8853",
    "docLabel$meta": {
      "confidence": "high",
      "note": "Constructed from provider and document identifier",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc8853/",
      "updated": "2026-10-20T21:46:40.114Z",
      "version": "extractDocs.js@commit:92f3ced618ff"
    },
    "docNumber": "8853",
    "docNumber$meta": {
      "confidence": "high",
      "note": "From the RFC index entry (rfc-index.xml <doc-id>)",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc8853/",
      "updated": "2026-10-20T21:46:40.114Z",
      "version": "extractDocs.js@commit:92f3ced618ff"
    },
    "docTitle": "Using Simulcast in Session Description Protocol (SDP) and RTP Sessions",
    "docTitle$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML title",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc8853/",
      "updated": "2026-10-20T21:46:40.114Z",
      "version": "extractDocs.js@commit:92f3ced618ff"
    },
    "docType": "Standard",
    "docType$meta": {
      "confidence": "high",
      "note": "Mapped from Datatracker std_level or RFC status text",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc8853/",
      "updated": "2026-10-20T21:46:40.114Z",
      "version": "extractDocs.js@commit:92f3ced618ff"
    },
    "doi": "10.17487/RFC8853",
    "doi$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML doi",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc8853/",
      "updated": "2026-10-20T21:46:40.114Z",
      "version": "extractDocs.js@commit:92f3ced618ff"
    },
    "href": "https://doi.org/10.17487/RFC8853",
    "href$meta": {
      "confidence": "high",
      "note": "Derived from DOI (https://doi.org/<doi>)",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc8853/",
      "updated": "2026-10-20T21:46:40.114Z",
      "version": "extractDocs.js@commit:92f3ced618ff"
    },
    "pages": "30",
    "pages$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML page-count",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc8853/",
      "updated": "2026-10-20T21:46:40.114Z",
      "version": "extractDocs.js@commit:92f3ced618ff"
    },
    "publicationDate": "2021-01-01",
    "publicationDate$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML date",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc8853/",
      "updated": "2026-10-20T21:46:40.114Z",
      "version": "extractDocs.js@commit:92f3ced618ff"
    },
    "publisher": "IETF",
    "publisher$meta": {
      "confidence": "high",
      "note": "Static: provider",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc8853/",
      "updated": "2026-10-20T21:46:40.114Z",
      "version": "extractDocs.js@commit:92f3ced618ff"
    },
    "references": {
      "bibliographic": [
        "RFC2198",
        "RFC3389",
        "RFC4588",
        "RFC4733",
        "RFC5104",
        "RFC5109",
        "RFC5583",
        "RFC6184",
        "RFC6190",
        "RFC6236",
        "RFC6464",
        "RFC7104",
        "RFC7656",
        "RFC7667",
        "RFC7741",
        "RFC7941",
        "RFC8108",
        "RFC8627",
        "RFC8872"
      ],
      "bibliographic$meta": {
        "confidence": "high",
        "note": "Parsed from RFC HTML references/informative sections",
        "originalValue": [],
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc8853/",
        "updated": "2026-10-20T21:46:40.114Z",
        "version": "extractDocs.js@commit:92f3ced618ff"
      },
      "normative": [
        "RFC2119",
        "RFC3264",
        "RFC3550",
        "RFC4566",
        "RFC5234",
        "RFC7405",
        "RFC7728",
        "RFC8174",
        "RFC8843",
        "RFC8851",
        "RFC8852",
        "RFC8859"
      ],
      "normative$meta": {
        "confidence": "high",
        "note": "Parsed from RFC HTML normative references sections",
        "originalValue": [],
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc8853/",
        "updated": "2026-10-20T21:46:40.114Z",
        "version": "extractDocs.js@commit:92f3ced618ff"
      }
    },
    "resolvedHref": "https://www.rfc-editor.org/info/rfc8853/",
    "resolvedHref$meta": {
      "confidence": "high",
      "note": "Final URL resolved via URL redirect verification",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc8853/",
      "updated": "2026-10-20T21:46:40.114Z",
      "version": "extractDocs.js@commit:92f3ced618ff"
    },
    "status": {
      "active": true,
      "active$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc8853/",
        "updated": "2026-10-20T21:46:40.114Z",
        "version": "extractDocs.js@commit:92f3ced618ff"
      },
      "errataExist": false,
      "errataExist$meta": {
        "confidence": "high",
        "note": "Derived from presence of errata links on RFC/Datatracker pages",
        "originalValue": null,
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc8853/",
        "updated": "2026-10-20T21:46:40.114Z",
        "version": "extractDocs.js@commit:92f3ced618ff"
      },
      "latestVersion": true,
      "latestVersion$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc8853/",
        "updated": "2026-10-20T21:46:40.114Z",
        "version": "extractDocs.js@commit:92f3ced618ff"
      },
      "statusNote": "Proposed Standard",
      "statusNote$meta": {
        "confidence": "high",
        "note": "Mapped from Datatracker doc.json std_level",
        "originalValue": null,
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc8853/",
        "updated": "2026-10-20T21:46:40.114Z",
        "version": "extractDocs.js@commit:92f3ced618ff"
      },
      "superseded": false,
      "superseded$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc8853/",
        "updated": "2026-10-20T21:46:40.114Z",
        "version": "extractDocs.js@commit:92f3ced618ff"
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}