{
  "opened": "2026-10",
  "sources": [
    {
      "kind": "RFC",
      "title": "RFC 3264, offer/answer with SDP",
      "url": "https://www.rfc-editor.org/rfc/rfc3264"
    },
    {
      "kind": "RFC",
      "title": "RFC 8866, SDP",
      "url": "https://www.rfc-editor.org/rfc/rfc8866"
    },
    {
      "kind": "Wikipedia",
      "title": "Session Initiation Protocol",
      "url": "https://en.wikipedia.org/wiki/Session_Initiation_Protocol"
    },
    {
      "kind": "RFC",
      "title": "RFC 3966, the tel URI",
      "url": "https://www.rfc-editor.org/rfc/rfc3966"
    },
    {
      "kind": "RFC",
      "title": "RFC 4733, RTP payload for DTMF",
      "url": "https://www.rfc-editor.org/rfc/rfc4733"
    },
    {
      "kind": "Confirm",
      "title": "A codec price list. confirm. None of these RFCs is a tariff.",
      "url": null
    }
  ]
}